646134240 has 192 divisors, whose sum is σ = 2121541632. Its totient is φ = 165120000.

The previous prime is 646134227. The next prime is 646134241. The reversal of 646134240 is 42431646.

It is a super-2 number, since 2×646134240² = 834978912200755200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 646134198 and 646134207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646134241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2574115 + ... + 2574365.

It is an arithmetic number, because the mean of its divisors is an integer number (11049696).

Almost surely, 2^646134240 is an apocalyptic number.

646134240 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 646134240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060770816).

646134240 is an abundant number, since it is smaller than the sum of its proper divisors (1475407392).

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

646134240 is a wasteful number, since it uses less digits than its factorization.

646134240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646134240 is about 25419.1707181804. The cubic root of 646134240 is about 864.5184217249.

Adding to 646134240 its reverse (42431646), we get a palindrome (688565886).

The spelling of 646134240 in words is "six hundred forty-six million, one hundred thirty-four thousand, two hundred forty".