87636645 has 24 divisors (see below), whose sum is σ = 159900000. Its totient is φ = 44279136.

The previous prime is 87636641. The next prime is 87636671. The reversal of 87636645 is 54663678.

87636645 is a `hidden beast` number, since 8 + 7 + 636 + 6 + 4 + 5 = 666.

It is not a de Polignac number, because 87636645 - 2² = 87636641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87636645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87636641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50395 + ... + 52104.

It is an arithmetic number, because the mean of its divisors is an integer number (6662500).

Almost surely, 2^87636645 is an apocalyptic number.

It is an amenable number.

87636645 is a deficient number, since it is larger than the sum of its proper divisors (72263355).

87636645 is a wasteful number, since it uses less digits than its factorization.

87636645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102529 (or 102526 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 87636645 is about 9361.4446000604. Note that the first 3 decimals coincide. The cubic root of 87636645 is about 444.1829809468.

The spelling of 87636645 in words is "eighty-seven million, six hundred thirty-six thousand, six hundred forty-five".