72156225 has 24 divisors (see below), whose sum is σ = 119804832. Its totient is φ = 38320000.

The previous prime is 72156209. The next prime is 72156239. The reversal of 72156225 is 52265127.

It is not a de Polignac number, because 72156225 - 2⁴ = 72156209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72156192 and 72156201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16909 + ... + 20741.

It is an arithmetic number, because the mean of its divisors is an integer number (4991868).

Almost surely, 2^72156225 is an apocalyptic number.

72156225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

72156225 is a deficient number, since it is larger than the sum of its proper divisors (47648607).

72156225 is a wasteful number, since it uses less digits than its factorization.

72156225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 4092 counting only the distinct ones).

The product of its digits is 8400, while the sum is 30.

The square root of 72156225 is about 8494.4820324726. The cubic root of 72156225 is about 416.3174371525.

The spelling of 72156225 in words is "seventy-two million, one hundred fifty-six thousand, two hundred twenty-five".