747647720 has 64 divisors (see below), whose sum is σ = 1799884800. Its totient is φ = 278657280.

The previous prime is 747647717. The next prime is 747647749. The reversal of 747647720 is 27746747.

It is a super-2 number, since 2×747647720² = 1117954226442396800, which contains 22 as substring.

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, 38297 + ... + 54423.

It is an arithmetic number, because the mean of its divisors is an integer number (28123200).

Almost surely, 2^747647720 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 747647720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899942400).

747647720 is an abundant number, since it is smaller than the sum of its proper divisors (1052237080).

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

747647720 is a wasteful number, since it uses less digits than its factorization.

747647720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16218 (or 16214 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 44.

The square root of 747647720 is about 27343.1475876498. The cubic root of 747647720 is about 907.6094402137.

The spelling of 747647720 in words is "seven hundred forty-seven million, six hundred forty-seven thousand, seven hundred twenty".