72640773 has 16 divisors (see below), whose sum is σ = 107889600. Its totient is φ = 48304080.

The previous prime is 72640769. The next prime is 72640783. The reversal of 72640773 is 37704627.

72640773 is a `hidden beast` number, since 7 + 2 + 640 + 7 + 7 + 3 = 666.

It is not a de Polignac number, because 72640773 - 2² = 72640769 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72640703) 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, 8103 + ... + 14523.

It is an arithmetic number, because the mean of its divisors is an integer number (6743100).

Almost surely, 2^72640773 is an apocalyptic number.

It is an amenable number.

72640773 is a deficient number, since it is larger than the sum of its proper divisors (35248827).

72640773 is a wasteful number, since it uses less digits than its factorization.

72640773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6849 (or 6843 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 36.

The square root of 72640773 is about 8522.9556493038. The cubic root of 72640773 is about 417.2472525700.

The spelling of 72640773 in words is "seventy-two million, six hundred forty thousand, seven hundred seventy-three".