72687420 has 72 divisors (see below), whose sum is σ = 237453216. Its totient is φ = 17891712.

The previous prime is 72687403. The next prime is 72687431. The reversal of 72687420 is 2478627.

It is a super-2 number, since 2×72687420² = 10566922052512800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13192 + ... + 17871.

Almost surely, 2^72687420 is an apocalyptic number.

It is an amenable number.

72687420 is an abundant number, since it is smaller than the sum of its proper divisors (164765796).

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

72687420 is a wasteful number, since it uses less digits than its factorization.

72687420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31091 (or 31086 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 72687420 is about 8525.6917607899. The cubic root of 72687420 is about 417.3365466266.

The spelling of 72687420 in words is "seventy-two million, six hundred eighty-seven thousand, four hundred twenty".