78404999 has 8 divisors (see below), whose sum is σ = 82581120. Its totient is φ = 74292856.

The previous prime is 78404959. The next prime is 78405007. The reversal of 78404999 is 99940487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78404999 - 2⁸ = 78404743 is a prime.

It is a super-2 number, since 2×78404999² = 12294687736380002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78404959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13469 + ... + 18390.

It is an arithmetic number, because the mean of its divisors is an integer number (10322640).

Almost surely, 2^78404999 is an apocalyptic number.

78404999 is a deficient number, since it is larger than the sum of its proper divisors (4176121).

78404999 is a wasteful number, since it uses less digits than its factorization.

78404999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31989.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78404999 is about 8854.6597337221. The cubic root of 78404999 is about 428.0040887460.

The spelling of 78404999 in words is "seventy-eight million, four hundred four thousand, nine hundred ninety-nine".