87639270 has 32 divisors (see below), whose sum is σ = 212271840. Its totient is φ = 23155200.

The previous prime is 87639259. The next prime is 87639281. The reversal of 87639270 is 7293678.

It is an interprime number because it is at equal distance from previous prime (87639259) and next prime (87639281).

It is a super-2 number, since 2×87639270² = 15361283292265800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10131 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (6633495).

Almost surely, 2^87639270 is an apocalyptic number.

87639270 is an abundant number, since it is smaller than the sum of its proper divisors (124632570).

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

87639270 is a wasteful number, since it uses less digits than its factorization.

87639270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26920.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 87639270 is about 9361.5848017310. The cubic root of 87639270 is about 444.1874158066.

The spelling of 87639270 in words is "eighty-seven million, six hundred thirty-nine thousand, two hundred seventy".