87890028 has 48 divisors (see below), whose sum is σ = 210362880. Its totient is φ = 28551744.

The previous prime is 87889961. The next prime is 87890041. The reversal of 87890028 is 82009878.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 78126 + ... + 79242.

It is an arithmetic number, because the mean of its divisors is an integer number (4382560).

Almost surely, 2^87890028 is an apocalyptic number.

It is an amenable number.

87890028 is an abundant number, since it is smaller than the sum of its proper divisors (122472852).

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

87890028 is a wasteful number, since it uses less digits than its factorization.

87890028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 87890028 is about 9374.9681599459. The cubic root of 87890028 is about 444.6106563791.

The spelling of 87890028 in words is "eighty-seven million, eight hundred ninety thousand, twenty-eight".