87043645 has 32 divisors (see below), whose sum is σ = 118429920. Its totient is φ = 60963840.

The previous prime is 87043643. The next prime is 87043651. The reversal of 87043645 is 54634078.

It can be written as a sum of positive squares in 16 ways, for example, as 52504516 + 34539129 = 7246^2 + 5877^2 .

It is not a de Polignac number, because 87043645 - 2¹ = 87043643 is a prime.

It is a super-2 number, since 2×87043645² = 15153192269772050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87043643) 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 31 ways as a sum of consecutive naturals, for example, 114607 + ... + 115363.

It is an arithmetic number, because the mean of its divisors is an integer number (3700935).

Almost surely, 2^87043645 is an apocalyptic number.

It is an amenable number.

87043645 is a deficient number, since it is larger than the sum of its proper divisors (31386275).

87043645 is a wasteful number, since it uses less digits than its factorization.

87043645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 87043645 is about 9329.7183773145. The cubic root of 87043645 is about 443.1788467452.

The spelling of 87043645 in words is "eighty-seven million, forty-three thousand, six hundred forty-five".