79878814 has 4 divisors (see below), whose sum is σ = 119818224. Its totient is φ = 39939406.

The previous prime is 79878811. The next prime is 79878857. The reversal of 79878814 is 41887897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41887897 = 601 ⋅69697.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79878811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19969702 + ... + 19969705.

It is an arithmetic number, because the mean of its divisors is an integer number (29954556).

Almost surely, 2^79878814 is an apocalyptic number.

79878814 is a deficient number, since it is larger than the sum of its proper divisors (39939410).

79878814 is a wasteful number, since it uses less digits than its factorization.

79878814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39939409.

The product of its digits is 903168, while the sum is 52.

The square root of 79878814 is about 8937.4948391593. The cubic root of 79878814 is about 430.6692552836.

The spelling of 79878814 in words is "seventy-nine million, eight hundred seventy-eight thousand, eight hundred fourteen".