647346240 has 168 divisors, whose sum is σ = 2269147608. Its totient is φ = 169328640.

The previous prime is 647346223. The next prime is 647346241. The reversal of 647346240 is 42643746.

647346240 is a `hidden beast` number, since 647 + 3 + 4 + 6 + 2 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 312016896 + 335329344 = 17664^2 + 18312^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 647346195 and 647346204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647346241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150520 + ... + 154760.

It is an arithmetic number, because the mean of its divisors is an integer number (13506831).

Almost surely, 2^647346240 is an apocalyptic number.

647346240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647346240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1134573804).

647346240 is an abundant number, since it is smaller than the sum of its proper divisors (1621801368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647346240 is a wasteful number, since it uses less digits than its factorization.

647346240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317 (or 4304 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The square root of 647346240 is about 25442.9998231341. Note that the first 3 decimals coincide. The cubic root of 647346240 is about 865.0586303494.

Adding to 647346240 its reverse (42643746), we get a palindrome (689989986).

The spelling of 647346240 in words is "six hundred forty-seven million, three hundred forty-six thousand, two hundred forty".