72999855 has 24 divisors (see below), whose sum is σ = 126799920. Its totient is φ = 38851200.

The previous prime is 72999851. The next prime is 72999869. The reversal of 72999855 is 55899927.

It is not a de Polignac number, because 72999855 - 2² = 72999851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72999851) 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, 24180 + ... + 27030.

It is an arithmetic number, because the mean of its divisors is an integer number (5283330).

Almost surely, 2^72999855 is an apocalyptic number.

72999855 is a deficient number, since it is larger than the sum of its proper divisors (53800065).

72999855 is a wasteful number, since it uses less digits than its factorization.

72999855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431 (or 3428 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 72999855 is about 8543.9952598301. The cubic root of 72999855 is about 417.9336429237.

The spelling of 72999855 in words is "seventy-two million, nine hundred ninety-nine thousand, eight hundred fifty-five".