72728042 has 8 divisors (see below), whose sum is σ = 109437156. Its totient is φ = 36248992.

The previous prime is 72728039. The next prime is 72728053. The reversal of 72728042 is 24082727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72267001 + 461041 = 8501^2 + 679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 56723 + ... + 57990.

Almost surely, 2^72728042 is an apocalyptic number.

72728042 is a deficient number, since it is larger than the sum of its proper divisors (36709114).

72728042 is a wasteful number, since it uses less digits than its factorization.

72728042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115032.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 72728042 is about 8528.0737567167. The cubic root of 72728042 is about 417.4142762074.

The spelling of 72728042 in words is "seventy-two million, seven hundred twenty-eight thousand, forty-two".