78992899 has 6 divisors (see below), whose sum is σ = 83191220. Its totient is φ = 74798676.

The previous prime is 78992887. The next prime is 78992909. The reversal of 78992899 is 99829987.

It is not a de Polignac number, because 78992899 - 2²¹ = 76895747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78992099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37722 + ... + 39760.

Almost surely, 2^78992899 is an apocalyptic number.

78992899 is a deficient number, since it is larger than the sum of its proper divisors (4198321).

78992899 is an frugal number, since it uses more digits than its factorization.

78992899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 2058 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 61.

The square root of 78992899 is about 8887.7949458794. The cubic root of 78992899 is about 429.0711860905.

The spelling of 78992899 in words is "seventy-eight million, nine hundred ninety-two thousand, eight hundred ninety-nine".