87020645 has 4 divisors (see below), whose sum is σ = 104424780. Its totient is φ = 69616512.

The previous prime is 87020629. The next prime is 87020663. The reversal of 87020645 is 54602078.

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 44809636 + 42211009 = 6694^2 + 6497^2 .

It is a cyclic number.

It is not a de Polignac number, because 87020645 - 2⁴ = 87020629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8702060 + ... + 8702069.

It is an arithmetic number, because the mean of its divisors is an integer number (26106195).

Almost surely, 2^87020645 is an apocalyptic number.

It is an amenable number.

87020645 is a deficient number, since it is larger than the sum of its proper divisors (17404135).

87020645 is a wasteful number, since it uses less digits than its factorization.

87020645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17404134.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 87020645 is about 9328.4856756067. The cubic root of 87020645 is about 443.1398088142.

The spelling of 87020645 in words is "eighty-seven million, twenty thousand, six hundred forty-five".