72665428 has 24 divisors (see below), whose sum is σ = 139656384. Its totient is φ = 32808000.

The previous prime is 72665413. The next prime is 72665449. The reversal of 72665428 is 82456627.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1176 + ... + 12112.

It is an arithmetic number, because the mean of its divisors is an integer number (5819016).

Almost surely, 2^72665428 is an apocalyptic number.

It is an amenable number.

72665428 is a deficient number, since it is larger than the sum of its proper divisors (66990956).

72665428 is a wasteful number, since it uses less digits than its factorization.

72665428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11103 (or 11101 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 72665428 is about 8524.4019145040. The cubic root of 72665428 is about 417.2944531845.

The spelling of 72665428 in words is "seventy-two million, six hundred sixty-five thousand, four hundred twenty-eight".