78916426 has 4 divisors (see below), whose sum is σ = 118374642. Its totient is φ = 39458212.

The previous prime is 78916379. The next prime is 78916433. The reversal of 78916426 is 62461987.

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., 77704225 + 1212201 = 8815^2 + 1101^2 .

It is a super-2 number, since 2×78916426² = 12455604585226952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19729105 + ... + 19729108.

Almost surely, 2^78916426 is an apocalyptic number.

78916426 is a deficient number, since it is larger than the sum of its proper divisors (39458216).

78916426 is a wasteful number, since it uses less digits than its factorization.

78916426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39458215.

The product of its digits is 145152, while the sum is 43.

The square root of 78916426 is about 8883.4917684433. The cubic root of 78916426 is about 428.9326801594.

The spelling of 78916426 in words is "seventy-eight million, nine hundred sixteen thousand, four hundred twenty-six".