28221170 has 32 divisors (see below), whose sum is σ = 52012800. Its totient is φ = 11022336.

The previous prime is 28221169. The next prime is 28221181. The reversal of 28221170 is 7112282.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109682 + ... + 109938.

It is an arithmetic number, because the mean of its divisors is an integer number (1625400).

Almost surely, 2^28221170 is an apocalyptic number.

28221170 is a deficient number, since it is larger than the sum of its proper divisors (23791630).

28221170 is a wasteful number, since it uses less digits than its factorization.

28221170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28221170 is about 5312.3601158054. The cubic root of 28221170 is about 304.4563278888.

The spelling of 28221170 in words is "twenty-eight million, two hundred twenty-one thousand, one hundred seventy".