87668021 has 4 divisors (see below), whose sum is σ = 100192032. Its totient is φ = 75144012.

The previous prime is 87668011. The next prime is 87668027. The reversal of 87668021 is 12086678.

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 87668021 - 2²² = 83473717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87668027) 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, 6261995 + ... + 6262008.

It is an arithmetic number, because the mean of its divisors is an integer number (25048008).

Almost surely, 2^87668021 is an apocalyptic number.

It is an amenable number.

87668021 is a deficient number, since it is larger than the sum of its proper divisors (12524011).

87668021 is a wasteful number, since it uses less digits than its factorization.

87668021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12524010.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 87668021 is about 9363.1202598279. The cubic root of 87668021 is about 444.2359839736.

The spelling of 87668021 in words is "eighty-seven million, six hundred sixty-eight thousand, twenty-one".