647139240 has 512 divisors, whose sum is σ = 2571264000. Its totient is φ = 143078400.

The previous prime is 647139239. The next prime is 647139253. The reversal of 647139240 is 42931746.

647139240 is a `hidden beast` number, since 647 + 1 + 3 + 9 + 2 + 4 + 0 = 666.

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 = 647139195 and 647139204.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10608810 + ... + 10608870.

It is an arithmetic number, because the mean of its divisors is an integer number (5022000).

Almost surely, 2^647139240 is an apocalyptic number.

647139240 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 647139240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285632000).

647139240 is an abundant number, since it is smaller than the sum of its proper divisors (1924124760).

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

647139240 is a wasteful number, since it uses less digits than its factorization.

647139240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 647139240 is about 25438.9315813381. The cubic root of 647139240 is about 864.9664147696.

The spelling of 647139240 in words is "six hundred forty-seven million, one hundred thirty-nine thousand, two hundred forty".