87992891 has 4 divisors (see below), whose sum is σ = 100563312. Its totient is φ = 75422472.

The previous prime is 87992837. The next prime is 87992897. The reversal of 87992891 is 19829978.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87992891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87992897) 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, 6285200 + ... + 6285213.

It is an arithmetic number, because the mean of its divisors is an integer number (25140828).

Almost surely, 2^87992891 is an apocalyptic number.

87992891 is a deficient number, since it is larger than the sum of its proper divisors (12570421).

87992891 is a wasteful number, since it uses less digits than its factorization.

87992891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12570420.

The product of its digits is 653184, while the sum is 53.

The square root of 87992891 is about 9380.4526010209. The cubic root of 87992891 is about 444.7840403107.

The spelling of 87992891 in words is "eighty-seven million, nine hundred ninety-two thousand, eight hundred ninety-one".