87521190 has 64 divisors (see below), whose sum is σ = 215550720. Its totient is φ = 22736000.

The previous prime is 87521149. The next prime is 87521221. The reversal of 87521190 is 9112578.

It is a super-2 number, since 2×87521190² = 15319917398032200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348565 + ... + 348815.

It is an arithmetic number, because the mean of its divisors is an integer number (3367980).

Almost surely, 2^87521190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87521190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107775360).

87521190 is an abundant number, since it is smaller than the sum of its proper divisors (128029530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87521190 is a wasteful number, since it uses less digits than its factorization.

87521190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 87521190 is about 9355.2760515123. The cubic root of 87521190 is about 443.9878354755.

The spelling of 87521190 in words is "eighty-seven million, five hundred twenty-one thousand, one hundred ninety".