78623938540 has 48 divisors (see below), whose sum is σ = 191513855232. Its totient is φ = 26554435776.

The previous prime is 78623938483. The next prime is 78623938559. The reversal of 78623938540 is 4583932687.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4181662 + ... + 4200421.

It is an arithmetic number, because the mean of its divisors is an integer number (3989871984).

Almost surely, 2^78623938540 is an apocalyptic number.

78623938540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78623938540 is an abundant number, since it is smaller than the sum of its proper divisors (112889916692).

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

78623938540 is a wasteful number, since it uses less digits than its factorization.

78623938540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382166 (or 8382164 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 78623938540 in words is "seventy-eight billion, six hundred twenty-three million, nine hundred thirty-eight thousand, five hundred forty".