87621138 has 24 divisors (see below), whose sum is σ = 207104976. Its totient is φ = 26551800.

The previous prime is 87621133. The next prime is 87621161. The reversal of 87621138 is 83112678.

It is not an unprimeable number, because it can be changed into a prime (87621133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221068 + ... + 221463.

It is an arithmetic number, because the mean of its divisors is an integer number (8629374).

Almost surely, 2^87621138 is an apocalyptic number.

87621138 is an abundant number, since it is smaller than the sum of its proper divisors (119483838).

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

87621138 is a wasteful number, since it uses less digits than its factorization.

87621138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442550 (or 442547 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 87621138 is about 9360.6163258623. The cubic root of 87621138 is about 444.1567805228.

The spelling of 87621138 in words is "eighty-seven million, six hundred twenty-one thousand, one hundred thirty-eight".