23281787538 has 24 divisors (see below), whose sum is σ = 53411160348. Its totient is φ = 7304090112.

The previous prime is 23281787533. The next prime is 23281787561. The reversal of 23281787538 is 83578718232.

23281787538 is a `hidden beast` number, since 2 + 3 + 28 + 1 + 7 + 87 + 538 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19451044089 + 3830743449 = 139467^2 + 61893^2 .

It is not an unprimeable number, because it can be changed into a prime (23281787533) 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, 38041831 + ... + 38042442.

Almost surely, 2^23281787538 is an apocalyptic number.

23281787538 is an abundant number, since it is smaller than the sum of its proper divisors (30129372810).

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

23281787538 is a wasteful number, since it uses less digits than its factorization.

23281787538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76084298 (or 76084295 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 23281787538 in words is "twenty-three billion, two hundred eighty-one million, seven hundred eighty-seven thousand, five hundred thirty-eight".