87642222 has 8 divisors (see below), whose sum is σ = 175284456. Its totient is φ = 29214072.

The previous prime is 87642221. The next prime is 87642223. The reversal of 87642222 is 22224678.

It is an interprime number because it is at equal distance from previous prime (87642221) and next prime (87642223).

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

87642222 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87642221) 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 3 ways as a sum of consecutive naturals, for example, 7303513 + ... + 7303524.

It is an arithmetic number, because the mean of its divisors is an integer number (21910557).

Almost surely, 2^87642222 is an apocalyptic number.

87642222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

87642222 is a wasteful number, since it uses less digits than its factorization.

87642222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14607042.

The product of its digits is 21504, while the sum is 33.

The square root of 87642222 is about 9361.7424660156. The cubic root of 87642222 is about 444.1924030173.

The spelling of 87642222 in words is "eighty-seven million, six hundred forty-two thousand, two hundred twenty-two".