72312428 has 12 divisors (see below), whose sum is σ = 130910640. Its totient is φ = 34909392.

The previous prime is 72312379. The next prime is 72312521. The reversal of 72312428 is 82421327.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 72312428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311576 + ... + 311807.

It is an arithmetic number, because the mean of its divisors is an integer number (10909220).

Almost surely, 2^72312428 is an apocalyptic number.

It is an amenable number.

72312428 is a deficient number, since it is larger than the sum of its proper divisors (58598212).

72312428 is a wasteful number, since it uses less digits than its factorization.

72312428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623416 (or 623414 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 72312428 is about 8503.6714423830. The cubic root of 72312428 is about 416.6176337679.

The spelling of 72312428 in words is "seventy-two million, three hundred twelve thousand, four hundred twenty-eight".