87658644 has 12 divisors (see below), whose sum is σ = 204536864. Its totient is φ = 29219544.

The previous prime is 87658643. The next prime is 87658651. The reversal of 87658644 is 44685678.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 87658593 and 87658602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87658643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3652432 + ... + 3652455.

Almost surely, 2^87658644 is an apocalyptic number.

It is an amenable number.

87658644 is an abundant number, since it is smaller than the sum of its proper divisors (116878220).

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

87658644 is a wasteful number, since it uses less digits than its factorization.

87658644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304894 (or 7304892 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The square root of 87658644 is about 9362.6195052453. The cubic root of 87658644 is about 444.2201448672.

The spelling of 87658644 in words is "eighty-seven million, six hundred fifty-eight thousand, six hundred forty-four".