72402728 has 16 divisors (see below), whose sum is σ = 143740980. Its totient is φ = 34071808.

The previous prime is 72402713. The next prime is 72402739. The reversal of 72402728 is 82720427.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58400164 + 14002564 = 7642^2 + 3742^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72402694 and 72402703.

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, 266051 + ... + 266322.

Almost surely, 2^72402728 is an apocalyptic number.

It is an amenable number.

72402728 is a deficient number, since it is larger than the sum of its proper divisors (71338252).

72402728 is a wasteful number, since it uses less digits than its factorization.

72402728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532396 (or 532392 counting only the distinct ones).

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

The square root of 72402728 is about 8508.9792572317. The cubic root of 72402728 is about 416.7909784459.

The spelling of 72402728 in words is "seventy-two million, four hundred two thousand, seven hundred twenty-eight".