87902509 has 4 divisors (see below), whose sum is σ = 90933660. Its totient is φ = 84871360.

The previous prime is 87902501. The next prime is 87902513. The reversal of 87902509 is 90520978.

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 27405225 + 60497284 = 5235^2 + 7778^2 .

It is a cyclic number.

It is not a de Polignac number, because 87902509 - 2³ = 87902501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87902501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515532 + ... + 1515589.

It is an arithmetic number, because the mean of its divisors is an integer number (22733415).

Almost surely, 2^87902509 is an apocalyptic number.

It is an amenable number.

87902509 is a deficient number, since it is larger than the sum of its proper divisors (3031151).

87902509 is a wasteful number, since it uses less digits than its factorization.

87902509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031150.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 87902509 is about 9375.6337919098. The cubic root of 87902509 is about 444.6317013262.

The spelling of 87902509 in words is "eighty-seven million, nine hundred two thousand, five hundred nine".