72817851 has 16 divisors (see below), whose sum is σ = 103154688. Its totient is φ = 45532800.

The previous prime is 72817841. The next prime is 72817873. The reversal of 72817851 is 15871827.

It is not a de Polignac number, because 72817851 - 2⁵ = 72817819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72817841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13566 + ... + 18156.

It is an arithmetic number, because the mean of its divisors is an integer number (6447168).

Almost surely, 2^72817851 is an apocalyptic number.

72817851 is a deficient number, since it is larger than the sum of its proper divisors (30336837).

72817851 is a wasteful number, since it uses less digits than its factorization.

72817851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922.

The product of its digits is 31360, while the sum is 39.

The square root of 72817851 is about 8533.3376236968. The cubic root of 72817851 is about 417.5860216930.

The spelling of 72817851 in words is "seventy-two million, eight hundred seventeen thousand, eight hundred fifty-one".