87376991 has 16 divisors (see below), whose sum is σ = 104882400. Its totient is φ = 71912448.

The previous prime is 87376973. The next prime is 87377021. The reversal of 87376991 is 19967378.

It is not a de Polignac number, because 87376991 - 2¹⁴ = 87360607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87376951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6206 + ... + 14603.

It is an arithmetic number, because the mean of its divisors is an integer number (6555150).

Almost surely, 2^87376991 is an apocalyptic number.

87376991 is a deficient number, since it is larger than the sum of its proper divisors (17505409).

87376991 is a wasteful number, since it uses less digits than its factorization.

87376991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20858.

The product of its digits is 571536, while the sum is 50.

The square root of 87376991 is about 9347.5660468381. The cubic root of 87376991 is about 443.7438648626.

The spelling of 87376991 in words is "eighty-seven million, three hundred seventy-six thousand, nine hundred ninety-one".