747643864 has 64 divisors (see below), whose sum is σ = 1608698880. Its totient is φ = 322608000.

The previous prime is 747643859. The next prime is 747643879. The reversal of 747643864 is 468346747.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141999 + ... + 147169.

It is an arithmetic number, because the mean of its divisors is an integer number (25135920).

Almost surely, 2^747643864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 747643864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804349440).

747643864 is an abundant number, since it is smaller than the sum of its proper divisors (861055016).

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

747643864 is a wasteful number, since it uses less digits than its factorization.

747643864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272 (or 5268 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 49.

The square root of 747643864 is about 27343.0770762912. The cubic root of 747643864 is about 907.6078798763.

The spelling of 747643864 in words is "seven hundred forty-seven million, six hundred forty-three thousand, eight hundred sixty-four".