78031739538 has 24 divisors (see below), whose sum is σ = 169087817808. Its totient is φ = 26007649272.

The previous prime is 78031739509. The next prime is 78031739557. The reversal of 78031739538 is 83593713087.

78031739538 is a `hidden beast` number, since 7 + 8 + 0 + 31 + 73 + 9 + 538 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76920 + ... + 402467.

It is an arithmetic number, because the mean of its divisors is an integer number (7045325742).

Almost surely, 2^78031739538 is an apocalyptic number.

78031739538 is an abundant number, since it is smaller than the sum of its proper divisors (91056078270).

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

78031739538 is a wasteful number, since it uses less digits than its factorization.

78031739538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488438 (or 488435 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 78031739538 in words is "seventy-eight billion, thirty-one million, seven hundred thirty-nine thousand, five hundred thirty-eight".