87045865 has 16 divisors (see below), whose sum is σ = 111028752. Its totient is φ = 65286144.

The previous prime is 87045863. The next prime is 87045883. The reversal of 87045865 is 56854078.

It can be written as a sum of positive squares in 8 ways, for example, as 9834496 + 77211369 = 3136^2 + 8787^2 .

It is a cyclic number.

It is not a de Polignac number, because 87045865 - 2¹ = 87045863 is a prime.

It is a super-2 number, since 2×87045865² = 15153965227196450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87045863) 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 15 ways as a sum of consecutive naturals, for example, 21697 + ... + 25393.

It is an arithmetic number, because the mean of its divisors is an integer number (6939297).

Almost surely, 2^87045865 is an apocalyptic number.

87045865 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87045865 is a deficient number, since it is larger than the sum of its proper divisors (23982887).

87045865 is a wasteful number, since it uses less digits than its factorization.

87045865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 87045865 is about 9329.8373512082. The cubic root of 87045865 is about 443.1826143902.

The spelling of 87045865 in words is "eighty-seven million, forty-five thousand, eight hundred sixty-five".