28198730 has 48 divisors (see below), whose sum is σ = 60203520. Its totient is φ = 9315264.

The previous prime is 28198727. The next prime is 28198739. The reversal of 28198730 is 3789182.

It is a super-2 number, since 2×28198730² = 1590336747225800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28198739) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 58631 + ... + 59109.

It is an arithmetic number, because the mean of its divisors is an integer number (1254240).

Almost surely, 2^28198730 is an apocalyptic number.

28198730 is an abundant number, since it is smaller than the sum of its proper divisors (32004790).

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

28198730 is a wasteful number, since it uses less digits than its factorization.

28198730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28198730 is about 5310.2476401765. The cubic root of 28198730 is about 304.3756105690.

The spelling of 28198730 in words is "twenty-eight million, one hundred ninety-eight thousand, seven hundred thirty".