87581953 has 4 divisors (see below), whose sum is σ = 91389888. Its totient is φ = 83774020.

The previous prime is 87581941. The next prime is 87581959. The reversal of 87581953 is 35918578.

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 a de Polignac number, because none of the positive numbers 2^k-87581953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87581959) 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, 1903933 + ... + 1903978.

It is an arithmetic number, because the mean of its divisors is an integer number (22847472).

Almost surely, 2^87581953 is an apocalyptic number.

It is an amenable number.

87581953 is a deficient number, since it is larger than the sum of its proper divisors (3807935).

87581953 is a wasteful number, since it uses less digits than its factorization.

87581953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807934.

The product of its digits is 302400, while the sum is 46.

The square root of 87581953 is about 9358.5230138094. The cubic root of 87581953 is about 444.0905602821.

It can be divided in two parts, 875 and 81953, that added together give a palindrome (82828).

The spelling of 87581953 in words is "eighty-seven million, five hundred eighty-one thousand, nine hundred fifty-three".