79501978 has 4 divisors (see below), whose sum is σ = 119252970. Its totient is φ = 39750988.

The previous prime is 79501973. The next prime is 79501997. The reversal of 79501978 is 87910597.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87910597 = 883 ⋅99559.

It can be written as a sum of positive squares in only one way, i.e., 64112049 + 15389929 = 8007^2 + 3923^2 .

It is not an unprimeable number, because it can be changed into a prime (79501973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19875493 + ... + 19875496.

Almost surely, 2^79501978 is an apocalyptic number.

79501978 is a deficient number, since it is larger than the sum of its proper divisors (39750992).

79501978 is a wasteful number, since it uses less digits than its factorization.

79501978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39750991.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 79501978 is about 8916.3881701057. The cubic root of 79501978 is about 429.9909462669.

The spelling of 79501978 in words is "seventy-nine million, five hundred one thousand, nine hundred seventy-eight".