31872047436 has 18 divisors (see below), whose sum is σ = 80565453332. Its totient is φ = 10624015800.

The previous prime is 31872047429. The next prime is 31872047479. The reversal of 31872047436 is 63474027813.

31872047436 is a `hidden beast` number, since 3 + 1 + 8 + 7 + 204 + 7 + 436 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 31872047391 and 31872047400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 442667290 + ... + 442667361.

Almost surely, 2^31872047436 is an apocalyptic number.

31872047436 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31872047436 is an abundant number, since it is smaller than the sum of its proper divisors (48693405896).

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

31872047436 is a wasteful number, since it uses less digits than its factorization.

31872047436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885334661 (or 885334656 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 31872047436 in words is "thirty-one billion, eight hundred seventy-two million, forty-seven thousand, four hundred thirty-six".