87699491881 has 27 divisors (see below), whose sum is σ = 92017387863. Its totient is φ = 83582835840.

The previous prime is 87699491879. The next prime is 87699491903. The reversal of 87699491881 is 18819499678.

The square root of 87699491881 is 296141.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 39380418025 + 48319073856 = 198445^2 + 219816^2 .

It is not a de Polignac number, because 87699491881 - 2¹ = 87699491879 is a prime.

It is a super-3 number, since 3×87699491881³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87699491881.

It is not an unprimeable number, because it can be changed into a prime (87699491801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 904118425 + ... + 904118521.

Almost surely, 2^87699491881 is an apocalyptic number.

87699491881 is the 296141-st square number.

87699491881 is the 148071-st centered octagonal number.

It is an amenable number.

87699491881 is a deficient number, since it is larger than the sum of its proper divisors (4317895982).

87699491881 is an frugal number, since it uses more digits than its factorization.

87699491881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 211 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 70.

The spelling of 87699491881 in words is "eighty-seven billion, six hundred ninety-nine million, four hundred ninety-one thousand, eight hundred eighty-one".