647435256 has 64 divisors (see below), whose sum is σ = 1745694720. Its totient is φ = 198913920.

The previous prime is 647435251. The next prime is 647435263. The reversal of 647435256 is 652534746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647435251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305641 + ... + 307751.

It is an arithmetic number, because the mean of its divisors is an integer number (27276480).

Almost surely, 2^647435256 is an apocalyptic number.

It is an amenable number.

647435256 is an abundant number, since it is smaller than the sum of its proper divisors (1098259464).

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

647435256 is a wasteful number, since it uses less digits than its factorization.

647435256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116 (or 3112 counting only the distinct ones).

The product of its digits is 604800, while the sum is 42.

The square root of 647435256 is about 25444.7490850273. The cubic root of 647435256 is about 865.0982796771.

The spelling of 647435256 in words is "six hundred forty-seven million, four hundred thirty-five thousand, two hundred fifty-six".