87091555 has 32 divisors (see below), whose sum is σ = 112527360. Its totient is φ = 64592640.

The previous prime is 87091531. The next prime is 87091559. The reversal of 87091555 is 55519078.

It is not a de Polignac number, because 87091555 - 2⁵ = 87091523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87091559) 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 31 ways as a sum of consecutive naturals, for example, 486456 + ... + 486634.

It is an arithmetic number, because the mean of its divisors is an integer number (3516480).

Almost surely, 2^87091555 is an apocalyptic number.

87091555 is a deficient number, since it is larger than the sum of its proper divisors (25435805).

87091555 is a wasteful number, since it uses less digits than its factorization.

87091555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 87091555 is about 9332.2856257189. The cubic root of 87091555 is about 443.2601423762.

The spelling of 87091555 in words is "eighty-seven million, ninety-one thousand, five hundred fifty-five".