87644656 has 60 divisors (see below), whose sum is σ = 197706096. Its totient is φ = 37480960.

The previous prime is 87644653. The next prime is 87644659. The reversal of 87644656 is 65644678.

It is an interprime number because it is at equal distance from previous prime (87644653) and next prime (87644659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87644653) 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, 31581 + ... + 34243.

Almost surely, 2^87644656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87644656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98853048).

87644656 is an abundant number, since it is smaller than the sum of its proper divisors (110061440).

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

87644656 is a wasteful number, since it uses less digits than its factorization.

87644656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710 (or 2693 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The square root of 87644656 is about 9361.8724622802. The cubic root of 87644656 is about 444.1965150168.

The spelling of 87644656 in words is "eighty-seven million, six hundred forty-four thousand, six hundred fifty-six".