87831538 has 4 divisors (see below), whose sum is σ = 131747310. Its totient is φ = 43915768.

The previous prime is 87831533. The next prime is 87831539. The reversal of 87831538 is 83513878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54272689 + 33558849 = 7367^2 + 5793^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87831494 and 87831503.

It is not an unprimeable number, because it can be changed into a prime (87831533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21957883 + ... + 21957886.

Almost surely, 2^87831538 is an apocalyptic number.

87831538 is a deficient number, since it is larger than the sum of its proper divisors (43915772).

87831538 is a wasteful number, since it uses less digits than its factorization.

87831538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43915771.

The product of its digits is 161280, while the sum is 43.

The square root of 87831538 is about 9371.8481635161. The cubic root of 87831538 is about 444.5120064004.

The spelling of 87831538 in words is "eighty-seven million, eight hundred thirty-one thousand, five hundred thirty-eight".