28198780 has 24 divisors (see below), whose sum is σ = 59775408. Its totient is φ = 11173248.

The previous prime is 28198769. The next prime is 28198783. The reversal of 28198780 is 8789182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28198783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4449 + ... + 8728.

It is an arithmetic number, because the mean of its divisors is an integer number (2490642).

Almost surely, 2^28198780 is an apocalyptic number.

28198780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28198780 is an abundant number, since it is smaller than the sum of its proper divisors (31576628).

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

28198780 is a wasteful number, since it uses less digits than its factorization.

28198780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13293 (or 13291 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 28198780 is about 5310.2523480528. The cubic root of 28198780 is about 304.3757904680.

The spelling of 28198780 in words is "twenty-eight million, one hundred ninety-eight thousand, seven hundred eighty".