72155902 has 24 divisors (see below), whose sum is σ = 133947216. Its totient is φ = 28544256.

The previous prime is 72155861. The next prime is 72155903. The reversal of 72155902 is 20955127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12883 + ... + 17614.

It is an arithmetic number, because the mean of its divisors is an integer number (5581134).

Almost surely, 2^72155902 is an apocalyptic number.

72155902 is a deficient number, since it is larger than the sum of its proper divisors (61791314).

72155902 is a wasteful number, since it uses less digits than its factorization.

72155902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30532 (or 30519 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 72155902 is about 8494.4630201090. The cubic root of 72155902 is about 416.3168159507.

The spelling of 72155902 in words is "seventy-two million, one hundred fifty-five thousand, nine hundred two".