87521830 has 16 divisors (see below), whose sum is σ = 171861264. Its totient is φ = 31826080.

The previous prime is 87521821. The next prime is 87521843. The reversal of 87521830 is 3812578.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397717 + ... + 397936.

It is an arithmetic number, because the mean of its divisors is an integer number (10741329).

Almost surely, 2^87521830 is an apocalyptic number.

87521830 is a deficient number, since it is larger than the sum of its proper divisors (84339434).

87521830 is a wasteful number, since it uses less digits than its factorization.

87521830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795671.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 87521830 is about 9355.3102567472. The cubic root of 87521830 is about 443.9889176954.

The spelling of 87521830 in words is "eighty-seven million, five hundred twenty-one thousand, eight hundred thirty".