87644 has 6 divisors (see below), whose sum is σ = 153384. Its totient is φ = 43820.

The previous prime is 87643. The next prime is 87649. The reversal of 87644 is 44678.

It is a nialpdrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87644.

It is not an unprimeable number, because it can be changed into a prime (87641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10952 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (25564).

2⁸⁷⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

87644 is a deficient number, since it is larger than the sum of its proper divisors (65740).

87644 is a wasteful number, since it uses less digits than its factorization.

87644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21915 (or 21913 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 87644 is about 296.0472935191. The cubic root of 87644 is about 44.4195406778.

The spelling of 87644 in words is "eighty-seven thousand, six hundred forty-four".