72642994 has 4 divisors (see below), whose sum is σ = 108964494. Its totient is φ = 36321496.

The previous prime is 72642991. The next prime is 72643001. The reversal of 72642994 is 49924627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49924627 = 73 ⋅683899.

It can be written as a sum of positive squares in only one way, i.e., 55726225 + 16916769 = 7465^2 + 4113^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72642994.

It is not an unprimeable number, because it can be changed into a prime (72642991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18160747 + ... + 18160750.

Almost surely, 2^72642994 is an apocalyptic number.

72642994 is a deficient number, since it is larger than the sum of its proper divisors (36321500).

72642994 is a wasteful number, since it uses less digits than its factorization.

72642994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36321499.

The product of its digits is 217728, while the sum is 43.

The square root of 72642994 is about 8523.0859434831. The cubic root of 72642994 is about 417.2515049876.

The spelling of 72642994 in words is "seventy-two million, six hundred forty-two thousand, nine hundred ninety-four".