72687530 has 16 divisors (see below), whose sum is σ = 131231880. Its totient is φ = 28987392.

The previous prime is 72687493. The next prime is 72687541. The reversal of 72687530 is 3578627.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28504921 + 44182609 = 5339^2 + 6647^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7415 + ... + 14154.

Almost surely, 2^72687530 is an apocalyptic number.

72687530 is a deficient number, since it is larger than the sum of its proper divisors (58544350).

72687530 is a wasteful number, since it uses less digits than its factorization.

72687530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21913.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 72687530 is about 8525.6982118768. The cubic root of 72687530 is about 417.3367571491.

The spelling of 72687530 in words is "seventy-two million, six hundred eighty-seven thousand, five hundred thirty".