87571644 has 12 divisors (see below), whose sum is σ = 204333864. Its totient is φ = 29190544.

The previous prime is 87571609. The next prime is 87571657. The reversal of 87571644 is 44617578.

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 = 87571596 and 87571605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3648807 + ... + 3648830.

It is an arithmetic number, because the mean of its divisors is an integer number (17027822).

Almost surely, 2^87571644 is an apocalyptic number.

It is an amenable number.

87571644 is an abundant number, since it is smaller than the sum of its proper divisors (116762220).

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

87571644 is a wasteful number, since it uses less digits than its factorization.

87571644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7297644 (or 7297642 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 87571644 is about 9357.9722162443. The cubic root of 87571644 is about 444.0731354243.

It can be divided in two parts, 8757 and 1644, that added together give a palindrome (10401).

The spelling of 87571644 in words is "eighty-seven million, five hundred seventy-one thousand, six hundred forty-four".