87221578723 has 8 divisors (see below), whose sum is σ = 87454660608. Its totient is φ = 86988734664.

The previous prime is 87221578711. The next prime is 87221578753. The reversal of 87221578723 is 32787512278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87221578723 - 2²⁵ = 87188024291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87221578753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687486 + ... + 804412.

It is an arithmetic number, because the mean of its divisors is an integer number (10931832576).

Almost surely, 2^87221578723 is an apocalyptic number.

87221578723 is a deficient number, since it is larger than the sum of its proper divisors (233081885).

87221578723 is a wasteful number, since it uses less digits than its factorization.

87221578723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118913.

The product of its digits is 2634240, while the sum is 52.

The spelling of 87221578723 in words is "eighty-seven billion, two hundred twenty-one million, five hundred seventy-eight thousand, seven hundred twenty-three".