87087691 has 4 divisors (see below), whose sum is σ = 87112584. Its totient is φ = 87062800.

The previous prime is 87087653. The next prime is 87087701. The reversal of 87087691 is 19678078.

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

It is a cyclic number.

It is not a de Polignac number, because 87087691 - 2⁷ = 87087563 is a prime.

It is a super-2 number, since 2×87087691² = 15168531847422962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87087601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6130 + ... + 14551.

It is an arithmetic number, because the mean of its divisors is an integer number (21778146).

Almost surely, 2^87087691 is an apocalyptic number.

87087691 is a deficient number, since it is larger than the sum of its proper divisors (24893).

87087691 is a wasteful number, since it uses less digits than its factorization.

87087691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24892.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 87087691 is about 9332.0786001833. The cubic root of 87087691 is about 443.2535868898.

It can be divided in two parts, 87087 and 691, that added together give a palindrome (87778).

The spelling of 87087691 in words is "eighty-seven million, eighty-seven thousand, six hundred ninety-one".