87644953 has 4 divisors (see below), whose sum is σ = 95612688. Its totient is φ = 79677220.

The previous prime is 87644867. The next prime is 87644981. The reversal of 87644953 is 35944678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87644953 - 2²¹ = 85547801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87644993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3983851 + ... + 3983872.

It is an arithmetic number, because the mean of its divisors is an integer number (23903172).

Almost surely, 2^87644953 is an apocalyptic number.

It is an amenable number.

87644953 is a deficient number, since it is larger than the sum of its proper divisors (7967735).

87644953 is a wasteful number, since it uses less digits than its factorization.

87644953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967734.

The product of its digits is 725760, while the sum is 46.

The square root of 87644953 is about 9361.8883244781. Note that the first 3 decimals coincide. The cubic root of 87644953 is about 444.1970167633.

The spelling of 87644953 in words is "eighty-seven million, six hundred forty-four thousand, nine hundred fifty-three".