87521222 has 8 divisors (see below), whose sum is σ = 131324976. Its totient is φ = 43746232.

The previous prime is 87521221. The next prime is 87521237. The reversal of 87521222 is 22212578.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87521221) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3743 + ... + 13749.

It is an arithmetic number, because the mean of its divisors is an integer number (16415622).

Almost surely, 2^87521222 is an apocalyptic number.

87521222 is a deficient number, since it is larger than the sum of its proper divisors (43803754).

87521222 is a wasteful number, since it uses less digits than its factorization.

87521222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14382.

The product of its digits is 4480, while the sum is 29.

The square root of 87521222 is about 9355.2777617770. The cubic root of 87521222 is about 443.9878895866.

The spelling of 87521222 in words is "eighty-seven million, five hundred twenty-one thousand, two hundred twenty-two".