87806291 has 12 divisors (see below), whose sum is σ = 93199680. Its totient is φ = 82637280.

The previous prime is 87806273. The next prime is 87806357. The reversal of 87806291 is 19260878.

It is not a de Polignac number, because 87806291 - 2⁶ = 87806227 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87806231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41405 + ... + 43473.

It is an arithmetic number, because the mean of its divisors is an integer number (7766640).

Almost surely, 2^87806291 is an apocalyptic number.

87806291 is a deficient number, since it is larger than the sum of its proper divisors (5393389).

87806291 is a wasteful number, since it uses less digits than its factorization.

87806291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174 (or 2137 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 87806291 is about 9370.5011071981. The cubic root of 87806291 is about 444.4694109563.

The spelling of 87806291 in words is "eighty-seven million, eight hundred six thousand, two hundred ninety-one".