28322990 has 16 divisors (see below), whose sum is σ = 51053760. Its totient is φ = 11313120.

The previous prime is 28322981. The next prime is 28323011. The reversal of 28322990 is 9922382.

It is a self number, because there is not a number n which added to its sum of digits gives 28322990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7556 + ... + 10664.

It is an arithmetic number, because the mean of its divisors is an integer number (3190860).

Almost surely, 2^28322990 is an apocalyptic number.

28322990 is a deficient number, since it is larger than the sum of its proper divisors (22730770).

28322990 is a wasteful number, since it uses less digits than its factorization.

28322990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28322990 is about 5321.9347985484. The cubic root of 28322990 is about 304.8220407706.

The spelling of 28322990 in words is "twenty-eight million, three hundred twenty-two thousand, nine hundred ninety".