87572509 has 4 divisors (see below), whose sum is σ = 87592320. Its totient is φ = 87552700.

The previous prime is 87572449. The next prime is 87572531. The reversal of 87572509 is 90527578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87572509 - 2¹⁵ = 87539741 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 (87572549) 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, 84 + ... + 13234.

It is an arithmetic number, because the mean of its divisors is an integer number (21898080).

Almost surely, 2^87572509 is an apocalyptic number.

It is an amenable number.

87572509 is a deficient number, since it is larger than the sum of its proper divisors (19811).

87572509 is a wasteful number, since it uses less digits than its factorization.

87572509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19810.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 87572509 is about 9358.0184334078. The cubic root of 87572509 is about 444.0745975490.

The spelling of 87572509 in words is "eighty-seven million, five hundred seventy-two thousand, five hundred nine".