87290165 has 4 divisors (see below), whose sum is σ = 104748204. Its totient is φ = 69832128.

The previous prime is 87290153. The next prime is 87290167. The reversal of 87290165 is 56109278.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47018449 + 40271716 = 6857^2 + 6346^2 .

It is a cyclic number.

It is not a de Polignac number, because 87290165 - 2⁴ = 87290149 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87290167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8729012 + ... + 8729021.

It is an arithmetic number, because the mean of its divisors is an integer number (26187051).

Almost surely, 2^87290165 is an apocalyptic number.

It is an amenable number.

87290165 is a deficient number, since it is larger than the sum of its proper divisors (17458039).

87290165 is a wasteful number, since it uses less digits than its factorization.

87290165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17458038.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 87290165 is about 9342.9205819166. The cubic root of 87290165 is about 443.5968342646.

The spelling of 87290165 in words is "eighty-seven million, two hundred ninety thousand, one hundred sixty-five".