87398665 has 8 divisors (see below), whose sum is σ = 106598088. Its totient is φ = 68772480.

The previous prime is 87398659. The next prime is 87398687. The reversal of 87398665 is 56689378.

It can be written as a sum of positive squares in 4 ways, for example, as 2408704 + 84989961 = 1552^2 + 9219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87398665 - 2¹⁵ = 87365897 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, 142972 + ... + 143581.

It is an arithmetic number, because the mean of its divisors is an integer number (13324761).

Almost surely, 2^87398665 is an apocalyptic number.

It is an amenable number.

87398665 is a deficient number, since it is larger than the sum of its proper divisors (19199423).

87398665 is a wasteful number, since it uses less digits than its factorization.

87398665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286619.

The product of its digits is 2177280, while the sum is 52.

The square root of 87398665 is about 9348.7253141805. The cubic root of 87398665 is about 443.7805522838.

The spelling of 87398665 in words is "eighty-seven million, three hundred ninety-eight thousand, six hundred sixty-five".