381720572172 has 36 divisors (see below), whose sum is σ = 966468701016. Its totient is φ = 127033959360.

The previous prime is 381720572171. The next prime is 381720572197. The reversal of 381720572172 is 271275027183.

381720572172 is a `hidden beast` number, since 3 + 8 + 1 + 7 + 2 + 0 + 572 + 1 + 72 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (381720572171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8570454 + ... + 8614877.

It is an arithmetic number, because the mean of its divisors is an integer number (26846352806).

Almost surely, 2^381720572172 is an apocalyptic number.

It is an amenable number.

381720572172 is an abundant number, since it is smaller than the sum of its proper divisors (584748128844).

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

381720572172 is a wasteful number, since it uses less digits than its factorization.

381720572172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17185958 (or 17185953 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 381720572172 in words is "three hundred eighty-one billion, seven hundred twenty million, five hundred seventy-two thousand, one hundred seventy-two".