28220370 has 32 divisors (see below), whose sum is σ = 68688000. Its totient is φ = 7418880.

The previous prime is 28220359. The next prime is 28220383. The reversal of 28220370 is 7302282.

It is a self number, because there is not a number n which added to its sum of digits gives 28220370.

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, 4495 + ... + 8754.

It is an arithmetic number, because the mean of its divisors is an integer number (2146500).

Almost surely, 2^28220370 is an apocalyptic number.

28220370 is an abundant number, since it is smaller than the sum of its proper divisors (40467630).

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

28220370 is a wasteful number, since it uses less digits than its factorization.

28220370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13330.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 28220370 is about 5312.2848191715. The cubic root of 28220370 is about 304.4534510017.

The spelling of 28220370 in words is "twenty-eight million, two hundred twenty thousand, three hundred seventy".