72987940 has 12 divisors (see below), whose sum is σ = 153274716. Its totient is φ = 29195168.

The previous prime is 72987923. The next prime is 72987961. The reversal of 72987940 is 4978927.

It can be written as a sum of positive squares in 2 ways, for example, as 36699364 + 36288576 = 6058^2 + 6024^2 .

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, 1824679 + ... + 1824718.

It is an arithmetic number, because the mean of its divisors is an integer number (12772893).

Almost surely, 2^72987940 is an apocalyptic number.

It is an amenable number.

72987940 is an abundant number, since it is smaller than the sum of its proper divisors (80286776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72987940 is a wasteful number, since it uses less digits than its factorization.

72987940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649406 (or 3649404 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 72987940 is about 8543.2979580488. The cubic root of 72987940 is about 417.9109033794.

The spelling of 72987940 in words is "seventy-two million, nine hundred eighty-seven thousand, nine hundred forty".