78426884 has 12 divisors (see below), whose sum is σ = 139180608. Its totient is φ = 38661000.

The previous prime is 78426857. The next prime is 78426919. The reversal of 78426884 is 48862487.

It is a happy number.

It is a super-2 number, since 2×78426884² = 12301552267898912, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 137792 + ... + 138359.

It is an arithmetic number, because the mean of its divisors is an integer number (11598384).

Almost surely, 2^78426884 is an apocalyptic number.

It is an amenable number.

78426884 is a deficient number, since it is larger than the sum of its proper divisors (60753724).

78426884 is a wasteful number, since it uses less digits than its factorization.

78426884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276226 (or 276224 counting only the distinct ones).

The product of its digits is 688128, while the sum is 47.

The square root of 78426884 is about 8855.8954375038. The cubic root of 78426884 is about 428.0439076275.

The spelling of 78426884 in words is "seventy-eight million, four hundred twenty-six thousand, eight hundred eighty-four".