78549879 has 4 divisors (see below), whose sum is σ = 104733176. Its totient is φ = 52366584.

The previous prime is 78549859. The next prime is 78549901. The reversal of 78549879 is 97894587.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78549879 - 2¹⁵ = 78517111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78549829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13091644 + ... + 13091649.

It is an arithmetic number, because the mean of its divisors is an integer number (26183294).

Almost surely, 2^78549879 is an apocalyptic number.

78549879 is a deficient number, since it is larger than the sum of its proper divisors (26183297).

78549879 is a wasteful number, since it uses less digits than its factorization.

78549879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26183296.

The product of its digits is 5080320, while the sum is 57.

The square root of 78549879 is about 8862.8369611541. The cubic root of 78549879 is about 428.2675544175.

The spelling of 78549879 in words is "seventy-eight million, five hundred forty-nine thousand, eight hundred seventy-nine".