87996921 has 4 divisors (see below), whose sum is σ = 117329232. Its totient is φ = 58664612.

The previous prime is 87996893. The next prime is 87996949. The reversal of 87996921 is 12969978.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (87996893) and next prime (87996949).

It is a cyclic number.

It is not a de Polignac number, because 87996921 - 2⁵ = 87996889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87991921) 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, 14666151 + ... + 14666156.

It is an arithmetic number, because the mean of its divisors is an integer number (29332308).

Almost surely, 2^87996921 is an apocalyptic number.

It is an amenable number.

87996921 is a deficient number, since it is larger than the sum of its proper divisors (29332311).

87996921 is a wasteful number, since it uses less digits than its factorization.

87996921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29332310.

The product of its digits is 489888, while the sum is 51.

The square root of 87996921 is about 9380.6674069599. The cubic root of 87996921 is about 444.7908304513.

The spelling of 87996921 in words is "eighty-seven million, nine hundred ninety-six thousand, nine hundred twenty-one".