36399978972 has 36 divisors (see below), whose sum is σ = 105155495536. Its totient is φ = 10399993920.

The previous prime is 36399978947. The next prime is 36399978997. The reversal of 36399978972 is 27987999363.

36399978972 is a `hidden beast` number, since 3 + 6 + 399 + 97 + 89 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (36399978947) and next prime (36399978997).

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 36399978972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72221929 + ... + 72222432.

Almost surely, 2^36399978972 is an apocalyptic number.

It is an amenable number.

36399978972 is an abundant number, since it is smaller than the sum of its proper divisors (68755516564).

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

36399978972 is a wasteful number, since it uses less digits than its factorization.

36399978972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144444378 (or 144444373 counting only the distinct ones).

The product of its digits is 277766496, while the sum is 72.

The spelling of 36399978972 in words is "thirty-six billion, three hundred ninety-nine million, nine hundred seventy-eight thousand, nine hundred seventy-two".