647615172 has 48 divisors (see below), whose sum is σ = 1597929984. Its totient is φ = 203808000.

The previous prime is 647615161. The next prime is 647615179. The reversal of 647615172 is 271516746.

It is a super-2 number, since 2×647615172² = 838810822009179168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647615172.

It is not an unprimeable number, because it can be changed into a prime (647615179) 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, 5979 + ... + 36482.

It is an arithmetic number, because the mean of its divisors is an integer number (33290208).

Almost surely, 2^647615172 is an apocalyptic number.

647615172 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

647615172 is an abundant number, since it is smaller than the sum of its proper divisors (950314812).

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

647615172 is a wasteful number, since it uses less digits than its factorization.

647615172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540 (or 42538 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 647615172 is about 25448.2842643664. The cubic root of 647615172 is about 865.1784064056.

The spelling of 647615172 in words is "six hundred forty-seven million, six hundred fifteen thousand, one hundred seventy-two".