72687042 has 12 divisors (see below), whose sum is σ = 157488630. Its totient is φ = 24229008.

The previous prime is 72687029. The next prime is 72687077. The reversal of 72687042 is 24078627.

It can be written as a sum of positive squares in only one way, i.e., 47073321 + 25613721 = 6861^2 + 5061^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 72686988 and 72687006.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2019067 + ... + 2019102.

Almost surely, 2^72687042 is an apocalyptic number.

72687042 is an abundant number, since it is smaller than the sum of its proper divisors (84801588).

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

72687042 is a wasteful number, since it uses less digits than its factorization.

72687042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4038177 (or 4038174 counting only the distinct ones).

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

The square root of 72687042 is about 8525.6695924719. The cubic root of 72687042 is about 417.3358231934.

The spelling of 72687042 in words is "seventy-two million, six hundred eighty-seven thousand, forty-two".