87771625 has 8 divisors (see below), whose sum is σ = 109539144. Its totient is φ = 70217200.

The previous prime is 87771617. The next prime is 87771631. The reversal of 87771625 is 52617778.

It can be written as a sum of positive squares in 4 ways, for example, as 27678121 + 60093504 = 5261^2 + 7752^2 .

It is not a de Polignac number, because 87771625 - 2³ = 87771617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350962 + ... + 351211.

It is an arithmetic number, because the mean of its divisors is an integer number (13692393).

Almost surely, 2^87771625 is an apocalyptic number.

It is an amenable number.

87771625 is a deficient number, since it is larger than the sum of its proper divisors (21767519).

87771625 is an equidigital number, since it uses as much as digits as its factorization.

87771625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702188 (or 702178 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 87771625 is about 9368.6511836016. The cubic root of 87771625 is about 444.4109109537.

The spelling of 87771625 in words is "eighty-seven million, seven hundred seventy-one thousand, six hundred twenty-five".