78166426 has 16 divisors (see below), whose sum is σ = 130624200. Its totient is φ = 34832448.

The previous prime is 78166409. The next prime is 78166433. The reversal of 78166426 is 62466187.

It can be written as a sum of positive squares in 4 ways, for example, as 62964225 + 15202201 = 7935^2 + 3899^2 .

It is a super-2 number, since 2×78166426² = 12219980307226952, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51081 + ... + 52588.

Almost surely, 2^78166426 is an apocalyptic number.

78166426 is a deficient number, since it is larger than the sum of its proper divisors (52457774).

78166426 is a wasteful number, since it uses less digits than its factorization.

78166426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103713.

The product of its digits is 96768, while the sum is 40.

The square root of 78166426 is about 8841.1778627059. The cubic root of 78166426 is about 427.5695332790.

The spelling of 78166426 in words is "seventy-eight million, one hundred sixty-six thousand, four hundred twenty-six".