72155612 has 12 divisors (see below), whose sum is σ = 127523256. Its totient is φ = 35720400.

The previous prime is 72155543. The next prime is 72155621. The reversal of 72155612 is 21655127.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88898 + ... + 89705.

It is an arithmetic number, because the mean of its divisors is an integer number (10626938).

Almost surely, 2^72155612 is an apocalyptic number.

It is an amenable number.

72155612 is a deficient number, since it is larger than the sum of its proper divisors (55367644).

72155612 is a wasteful number, since it uses less digits than its factorization.

72155612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178708 (or 178706 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 72155612 is about 8494.4459501488. The cubic root of 72155612 is about 416.3162582138.

The spelling of 72155612 in words is "seventy-two million, one hundred fifty-five thousand, six hundred twelve".