87564993 has 4 divisors (see below), whose sum is σ = 116753328. Its totient is φ = 58376660.

The previous prime is 87564959. The next prime is 87565031. The reversal of 87564993 is 39946578.

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 87564993 - 2¹⁰ = 87563969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87564923) 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, 14594163 + ... + 14594168.

It is an arithmetic number, because the mean of its divisors is an integer number (29188332).

Almost surely, 2^87564993 is an apocalyptic number.

It is an amenable number.

87564993 is a deficient number, since it is larger than the sum of its proper divisors (29188335).

87564993 is a wasteful number, since it uses less digits than its factorization.

87564993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29188334.

The product of its digits is 1632960, while the sum is 51.

The square root of 87564993 is about 9357.6168440474. The cubic root of 87564993 is about 444.0618928003.

The spelling of 87564993 in words is "eighty-seven million, five hundred sixty-four thousand, nine hundred ninety-three".