32505720138 has 36 divisors (see below), whose sum is σ = 71596793814. Its totient is φ = 10655654400.

The previous prime is 32505720089. The next prime is 32505720161. The reversal of 32505720138 is 83102750523.

It is a happy number.

32505720138 is a `hidden beast` number, since 3 + 2 + 50 + 572 + 0 + 1 + 38 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26138158929 + 6367561209 = 161673^2 + 79797^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5971498 + ... + 5976938.

Almost surely, 2^32505720138 is an apocalyptic number.

32505720138 is an abundant number, since it is smaller than the sum of its proper divisors (39091073676).

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

32505720138 is an frugal number, since it uses more digits than its factorization.

32505720138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10951 (or 5507 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 32505720138 in words is "thirty-two billion, five hundred five million, seven hundred twenty thousand, one hundred thirty-eight".