87769721 has 8 divisors (see below), whose sum is σ = 99496320. Its totient is φ = 76753872.

The previous prime is 87769663. The next prime is 87769729. The reversal of 87769721 is 12796778.

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

It is a de Polignac number, because none of the positive numbers 2^k-87769721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87769729) 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, 177425 + ... + 177918.

It is an arithmetic number, because the mean of its divisors is an integer number (12437040).

Almost surely, 2^87769721 is an apocalyptic number.

It is an amenable number.

87769721 is a deficient number, since it is larger than the sum of its proper divisors (11726599).

87769721 is a wasteful number, since it uses less digits than its factorization.

87769721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355375.

The product of its digits is 296352, while the sum is 47.

The square root of 87769721 is about 9368.5495675691. The cubic root of 87769721 is about 444.4076974456.

The spelling of 87769721 in words is "eighty-seven million, seven hundred sixty-nine thousand, seven hundred twenty-one".