78997900 has 18 divisors (see below), whose sum is σ = 171425660. Its totient is φ = 31599120.

The previous prime is 78997883. The next prime is 78997949. The reversal of 78997900 is 979987.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394890 + ... + 395089.

Almost surely, 2^78997900 is an apocalyptic number.

It is an amenable number.

78997900 is an abundant number, since it is smaller than the sum of its proper divisors (92427760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78997900 is a wasteful number, since it uses less digits than its factorization.

78997900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789993 (or 789986 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 49.

The square root of 78997900 is about 8888.0762823009. The cubic root of 78997900 is about 429.0802406584.

It can be divided in two parts, 78997 and 900, that added together give a palindrome (79897).

The spelling of 78997900 in words is "seventy-eight million, nine hundred ninety-seven thousand, nine hundred".