72999856 has 20 divisors (see below), whose sum is σ = 141787800. Its totient is φ = 36409472.

The previous prime is 72999851. The next prime is 72999869. The reversal of 72999856 is 65899927.

It is a junction number, because it is equal to n+sod(n) for n = 72999797 and 72999806.

It is not an unprimeable number, because it can be changed into a prime (72999851) 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 3 ways as a sum of consecutive naturals, for example, 1260 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (7089390).

Almost surely, 2^72999856 is an apocalyptic number.

It is an amenable number.

72999856 is a deficient number, since it is larger than the sum of its proper divisors (68787944).

72999856 is a wasteful number, since it uses less digits than its factorization.

72999856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11316 (or 11310 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The square root of 72999856 is about 8543.9953183508. The cubic root of 72999856 is about 417.9336448321.

It can be divided in two parts, 729 and 99856, that multiplied together give a square (72795024 = 8532²).

The spelling of 72999856 in words is "seventy-two million, nine hundred ninety-nine thousand, eight hundred fifty-six".