87966721 has 8 divisors (see below), whose sum is σ = 93239424. Its totient is φ = 82704960.

The previous prime is 87966719. The next prime is 87966727. The reversal of 87966721 is 12766978.

It is a happy number.

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 87966721 - 2¹ = 87966719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87966727) 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, 18676 + ... + 22906.

It is an arithmetic number, because the mean of its divisors is an integer number (11654928).

Almost surely, 2^87966721 is an apocalyptic number.

It is an amenable number.

87966721 is a deficient number, since it is larger than the sum of its proper divisors (5272703).

87966721 is a wasteful number, since it uses less digits than its factorization.

87966721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471.

The product of its digits is 254016, while the sum is 46.

The square root of 87966721 is about 9379.0575752578. The cubic root of 87966721 is about 444.7399414736.

It can be divided in two parts, 879 and 66721, that added together give a square (67600 = 260²).

The spelling of 87966721 in words is "eighty-seven million, nine hundred sixty-six thousand, seven hundred twenty-one".