78404 has 12 divisors (see below), whose sum is σ = 145404. Its totient is φ = 36864.

The previous prime is 78401. The next prime is 78427. The reversal of 78404 is 40487.

It can be written as a sum of positive squares in 2 ways, for example, as 61504 + 16900 = 248^2 + 130^2 .

It is a super-2 number, since 2×78404² = 12294374432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78404.

It is not an unprimeable number, because it can be changed into a prime (78401) 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, 509 + ... + 644.

It is an arithmetic number, because the mean of its divisors is an integer number (12117).

2⁷⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

78404 is a deficient number, since it is larger than the sum of its proper divisors (67000).

78404 is a wasteful number, since it uses less digits than its factorization.

78404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 78404 is about 280.0071427660. The cubic root of 78404 is about 42.8002270929.

The spelling of 78404 in words is "seventy-eight thousand, four hundred four".