79878466 has 4 divisors (see below), whose sum is σ = 119817702. Its totient is φ = 39939232.

The previous prime is 79878443. The next prime is 79878467. The reversal of 79878466 is 66487897.

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., 43626025 + 36252441 = 6605^2 + 6021^2 .

It is not an unprimeable number, because it can be changed into a prime (79878467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19969615 + ... + 19969618.

Almost surely, 2^79878466 is an apocalyptic number.

79878466 is a deficient number, since it is larger than the sum of its proper divisors (39939236).

79878466 is a wasteful number, since it uses less digits than its factorization.

79878466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39939235.

The product of its digits is 4064256, while the sum is 55.

The square root of 79878466 is about 8937.4753705954. The cubic root of 79878466 is about 430.6686298649.

The spelling of 79878466 in words is "seventy-nine million, eight hundred seventy-eight thousand, four hundred sixty-six".