78903621918 has 24 divisors (see below), whose sum is σ = 186499470456. Its totient is φ = 23910188400.

The previous prime is 78903621917. The next prime is 78903621947. The reversal of 78903621918 is 81912630987.

78903621918 is a `hidden beast` number, since 7 + 8 + 9 + 0 + 3 + 621 + 9 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78903621917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199251373 + ... + 199251768.

It is an arithmetic number, because the mean of its divisors is an integer number (7770811269).

Almost surely, 2^78903621918 is an apocalyptic number.

78903621918 is an abundant number, since it is smaller than the sum of its proper divisors (107595848538).

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

78903621918 is a wasteful number, since it uses less digits than its factorization.

78903621918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398503160 (or 398503157 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 78903621918 in words is "seventy-eight billion, nine hundred three million, six hundred twenty-one thousand, nine hundred eighteen".