72942086642 has 4 divisors (see below), whose sum is σ = 109413129966. Its totient is φ = 36471043320.

The previous prime is 72942086617. The next prime is 72942086669. The reversal of 72942086642 is 24668024927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 59048514001 + 13893572641 = 242999^2 + 117871^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18235521659 + ... + 18235521662.

Almost surely, 2^72942086642 is an apocalyptic number.

72942086642 is a deficient number, since it is larger than the sum of its proper divisors (36471043324).

72942086642 is a wasteful number, since it uses less digits than its factorization.

72942086642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36471043323.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 72942086642 in words is "seventy-two billion, nine hundred forty-two million, eighty-six thousand, six hundred forty-two".