28198390 has 16 divisors (see below), whose sum is σ = 55371600. Its totient is φ = 10253920.

The previous prime is 28198381. The next prime is 28198421. The reversal of 28198390 is 9389182.

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, 128065 + ... + 128284.

It is an arithmetic number, because the mean of its divisors is an integer number (3460725).

Almost surely, 2^28198390 is an apocalyptic number.

28198390 is a deficient number, since it is larger than the sum of its proper divisors (27173210).

28198390 is a wasteful number, since it uses less digits than its factorization.

28198390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256367.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28198390 is about 5310.2156265071. The cubic root of 28198390 is about 304.3743872501.

The spelling of 28198390 in words is "twenty-eight million, one hundred ninety-eight thousand, three hundred ninety".