87699090 has 64 divisors (see below), whose sum is σ = 226592640. Its totient is φ = 21642240.

The previous prime is 87699089. The next prime is 87699091. The reversal of 87699090 is 9099678.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (87699089) and next prime (87699091).

It is a super-2 number, since 2×87699090² = 15382260773656200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87699091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29701 + ... + 32519.

It is an arithmetic number, because the mean of its divisors is an integer number (3540510).

Almost surely, 2^87699090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87699090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113296320).

87699090 is an abundant number, since it is smaller than the sum of its proper divisors (138893550).

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

87699090 is a wasteful number, since it uses less digits than its factorization.

87699090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 87699090 is about 9364.7792285777. The cubic root of 87699090 is about 444.2884559298.

The spelling of 87699090 in words is "eighty-seven million, six hundred ninety-nine thousand, ninety".