87077991 has 64 divisors (see below), whose sum is σ = 157925376. Its totient is φ = 41212800.

The previous prime is 87077989. The next prime is 87077999. The reversal of 87077991 is 19977078.

It is not a de Polignac number, because 87077991 - 2¹ = 87077989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87077991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87077999) 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 63 ways as a sum of consecutive naturals, for example, 321186 + ... + 321456.

It is an arithmetic number, because the mean of its divisors is an integer number (2467584).

Almost surely, 2^87077991 is an apocalyptic number.

87077991 is a deficient number, since it is larger than the sum of its proper divisors (70847385).

87077991 is a wasteful number, since it uses less digits than its factorization.

87077991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its (nonzero) digits is 222264, while the sum is 48.

The square root of 87077991 is about 9331.5588729858. The cubic root of 87077991 is about 443.2371294571.

The spelling of 87077991 in words is "eighty-seven million, seventy-seven thousand, nine hundred ninety-one".