78239993500 has 24 divisors (see below), whose sum is σ = 170876146896. Its totient is φ = 31295997200.

The previous prime is 78239993483. The next prime is 78239993521. The reversal of 78239993500 is 539993287.

It is a super-2 number, since 2×78239993500² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78239494 + ... + 78240493.

It is an arithmetic number, because the mean of its divisors is an integer number (7119839454).

Almost surely, 2^78239993500 is an apocalyptic number.

It is an amenable number.

78239993500 is an abundant number, since it is smaller than the sum of its proper divisors (92636153396).

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

78239993500 is a wasteful number, since it uses less digits than its factorization.

78239993500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156480006 (or 156479994 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 78239993500 in words is "seventy-eight billion, two hundred thirty-nine million, nine hundred ninety-three thousand, five hundred".