65573172 has 72 divisors (see below), whose sum is σ = 197776320. Its totient is φ = 18733680.

The previous prime is 65573171. The next prime is 65573191. The reversal of 65573172 is 27137556.

65573172 is a `hidden beast` number, since 6 + 557 + 31 + 72 = 666.

It is a super-2 number, since 2×65573172² = 8599681772283168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65573171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 904 + ... + 11487.

Almost surely, 2^65573172 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 65573172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98888160).

65573172 is an abundant number, since it is smaller than the sum of its proper divisors (132203148).

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

65573172 is a wasteful number, since it uses less digits than its factorization.

65573172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12418 (or 12403 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 65573172 is about 8097.7263475620. The cubic root of 65573172 is about 403.2509484230.

The spelling of 65573172 in words is "sixty-five million, five hundred seventy-three thousand, one hundred seventy-two".