78404384 has 24 divisors (see below), whose sum is σ = 157274460. Its totient is φ = 38461696.

The previous prime is 78404383. The next prime is 78404399. The reversal of 78404384 is 48340487.

It can be written as a sum of positive squares in 2 ways, for example, as 60528400 + 17875984 = 7780^2 + 4228^2 .

It is a super-2 number, since 2×78404384² = 12294494860838912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78404383) by changing a digit.

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, 21419 + ... + 24810.

Almost surely, 2^78404384 is an apocalyptic number.

It is an amenable number.

78404384 is an abundant number, since it is smaller than the sum of its proper divisors (78870076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78404384 is a wasteful number, since it uses less digits than its factorization.

78404384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46292 (or 46284 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 78404384 is about 8854.6250061762. The cubic root of 78404384 is about 428.0029696711.

The spelling of 78404384 in words is "seventy-eight million, four hundred four thousand, three hundred eighty-four".