78707899 has 4 divisors (see below), whose sum is σ = 82850440. Its totient is φ = 74565360.

The previous prime is 78707897. The next prime is 78707903. The reversal of 78707899 is 99870787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78707899 - 2¹ = 78707897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78707897) 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, 2071242 + ... + 2071279.

It is an arithmetic number, because the mean of its divisors is an integer number (20712610).

Almost surely, 2^78707899 is an apocalyptic number.

78707899 is a deficient number, since it is larger than the sum of its proper divisors (4142541).

78707899 is a wasteful number, since it uses less digits than its factorization.

78707899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142540.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78707899 is about 8871.7472349025. The cubic root of 78707899 is about 428.5545461974.

The spelling of 78707899 in words is "seventy-eight million, seven hundred seven thousand, eight hundred ninety-nine".