87639288 has 32 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 26557280.

The previous prime is 87639281. The next prime is 87639323. The reversal of 87639288 is 88293678.

It is a super-2 number, since 2×87639288² = 15361289602293888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87639288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639281) 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 7 ways as a sum of consecutive naturals, for example, 165720 + ... + 166247.

It is an arithmetic number, because the mean of its divisors is an integer number (7469280).

Almost surely, 2^87639288 is an apocalyptic number.

87639288 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

87639288 is an abundant number, since it is smaller than the sum of its proper divisors (151377672).

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

87639288 is a wasteful number, since it uses less digits than its factorization.

87639288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331987 (or 331983 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 87639288 is about 9361.5857631066. The cubic root of 87639288 is about 444.1874462167.

The spelling of 87639288 in words is "eighty-seven million, six hundred thirty-nine thousand, two hundred eighty-eight".