87921222 has 16 divisors (see below), whose sum is σ = 176923200. Its totient is φ = 29126952.

The previous prime is 87921221. The next prime is 87921241. The reversal of 87921222 is 22212978.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87921221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43972 + ... + 45927.

It is an arithmetic number, because the mean of its divisors is an integer number (11057700).

Almost surely, 2^87921222 is an apocalyptic number.

87921222 is an abundant number, since it is smaller than the sum of its proper divisors (89001978).

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

87921222 is a wasteful number, since it uses less digits than its factorization.

87921222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90067.

The product of its digits is 8064, while the sum is 33.

The square root of 87921222 is about 9376.6316980033. The cubic root of 87921222 is about 444.6632506822.

The spelling of 87921222 in words is "eighty-seven million, nine hundred twenty-one thousand, two hundred twenty-two".