78057999 has 20 divisors (see below), whose sum is σ = 123466464. Its totient is φ = 48976704.

The previous prime is 78057989. The next prime is 78058037. The reversal of 78057999 is 99975087.

It is not a de Polignac number, because 78057999 - 2¹⁶ = 77992463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057919) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26967 + ... + 29720.

Almost surely, 2^78057999 is an apocalyptic number.

78057999 is a deficient number, since it is larger than the sum of its proper divisors (45408465).

78057999 is a wasteful number, since it uses less digits than its factorization.

78057999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56716 (or 56707 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 78057999 is about 8835.0438029474. The cubic root of 78057999 is about 427.3717436118.

The spelling of 78057999 in words is "seventy-eight million, fifty-seven thousand, nine hundred ninety-nine".