78366404 has 24 divisors (see below), whose sum is σ = 139072248. Its totient is φ = 38635520.

The previous prime is 78366377. The next prime is 78366443. The reversal of 78366404 is 40466387.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1768900 + 76597504 = 1330^2 + 8752^2 .

It is a super-2 number, since 2×78366404² = 12282586551782432, 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, 126704 + ... + 127320.

It is an arithmetic number, because the mean of its divisors is an integer number (5794677).

Almost surely, 2^78366404 is an apocalyptic number.

It is an amenable number.

78366404 is a deficient number, since it is larger than the sum of its proper divisors (60705844).

78366404 is a wasteful number, since it uses less digits than its factorization.

78366404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 78366404 is about 8852.4801044679. The cubic root of 78366404 is about 427.9338486285.

The spelling of 78366404 in words is "seventy-eight million, three hundred sixty-six thousand, four hundred four".