72642706 has 4 divisors (see below), whose sum is σ = 108964062. Its totient is φ = 36321352.

The previous prime is 72642677. The next prime is 72642737. The reversal of 72642706 is 60724627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60724627 = 19 ⋅3196033.

It can be written as a sum of positive squares in only one way, i.e., 60980481 + 11662225 = 7809^2 + 3415^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18160675 + ... + 18160678.

Almost surely, 2^72642706 is an apocalyptic number.

72642706 is a deficient number, since it is larger than the sum of its proper divisors (36321356).

72642706 is a wasteful number, since it uses less digits than its factorization.

72642706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36321355.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 72642706 is about 8523.0690481774. The cubic root of 72642706 is about 417.2509535759.

The spelling of 72642706 in words is "seventy-two million, six hundred forty-two thousand, seven hundred six".