72647149426 has 4 divisors (see below), whose sum is σ = 108970724142. Its totient is φ = 36323574712.

The previous prime is 72647149417. The next prime is 72647149511. The reversal of 72647149426 is 62494174627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62494174627 = 31 ⋅2015941117.

It can be written as a sum of positive squares in only one way, i.e., 68097512025 + 4549637401 = 260955^2 + 67451^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18161787355 + ... + 18161787358.

Almost surely, 2^72647149426 is an apocalyptic number.

72647149426 is a deficient number, since it is larger than the sum of its proper divisors (36323574716).

72647149426 is a wasteful number, since it uses less digits than its factorization.

72647149426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36323574715.

The product of its digits is 4064256, while the sum is 52.

The spelling of 72647149426 in words is "seventy-two billion, six hundred forty-seven million, one hundred forty-nine thousand, four hundred twenty-six".