72178725 has 24 divisors (see below), whose sum is σ = 122116192. Its totient is φ = 37598400.

The previous prime is 72178723. The next prime is 72178783. The reversal of 72178725 is 52787127.

It is not a de Polignac number, because 72178725 - 2¹ = 72178723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72178723) 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, 7966 + ... + 14415.

Almost surely, 2^72178725 is an apocalyptic number.

72178725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

72178725 is a deficient number, since it is larger than the sum of its proper divisors (49937467).

72178725 is a wasteful number, since it uses less digits than its factorization.

72178725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22437 (or 22432 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 72178725 is about 8495.8063184138. The cubic root of 72178725 is about 416.3607051629.

The spelling of 72178725 in words is "seventy-two million, one hundred seventy-eight thousand, seven hundred twenty-five".