78407799 has 8 divisors (see below), whose sum is σ = 104649072. Its totient is φ = 52219200.

The previous prime is 78407783. The next prime is 78407809. The reversal of 78407799 is 99770487.

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

It is not a de Polignac number, because 78407799 - 2⁴ = 78407783 is a prime.

It is a super-2 number, since 2×78407799² = 12295565888048802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78407729) 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, 9552 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (13081134).

Almost surely, 2^78407799 is an apocalyptic number.

78407799 is a deficient number, since it is larger than the sum of its proper divisors (26241273).

78407799 is a wasteful number, since it uses less digits than its factorization.

78407799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26337.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 78407799 is about 8854.8178411529. The cubic root of 78407799 is about 428.0091836472.

The spelling of 78407799 in words is "seventy-eight million, four hundred seven thousand, seven hundred ninety-nine".