38978579772 has 36 divisors (see below), whose sum is σ = 107486387736. Its totient is φ = 11811690720.

The previous prime is 38978579737. The next prime is 38978579779. The reversal of 38978579772 is 27797587983.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 38978579772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38978579779) 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, 49214983 + ... + 49215774.

Almost surely, 2^38978579772 is an apocalyptic number.

It is an amenable number.

38978579772 is an abundant number, since it is smaller than the sum of its proper divisors (68507807964).

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

38978579772 is a wasteful number, since it uses less digits than its factorization.

38978579772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98430778 (or 98430773 counting only the distinct ones).

The product of its digits is 373403520, while the sum is 72.

The spelling of 38978579772 in words is "thirty-eight billion, nine hundred seventy-eight million, five hundred seventy-nine thousand, seven hundred seventy-two".