72805251 has 4 divisors (see below), whose sum is σ = 97073672. Its totient is φ = 48536832.

The previous prime is 72805231. The next prime is 72805253. The reversal of 72805251 is 15250827.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72805251 - 2⁷ = 72805123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72805253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12134206 + ... + 12134211.

It is an arithmetic number, because the mean of its divisors is an integer number (24268418).

Almost surely, 2^72805251 is an apocalyptic number.

72805251 is a deficient number, since it is larger than the sum of its proper divisors (24268421).

72805251 is a wasteful number, since it uses less digits than its factorization.

72805251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24268420.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 72805251 is about 8532.5993108783. The cubic root of 72805251 is about 417.5619347084.

The spelling of 72805251 in words is "seventy-two million, eight hundred five thousand, two hundred fifty-one".