28198620 has 36 divisors (see below), whose sum is σ = 85536360. Its totient is φ = 7519584.

The previous prime is 28198609. The next prime is 28198633. The reversal of 28198620 is 2689182.

28198620 is a `hidden beast` number, since 28 + 1 + 9 + 8 + 620 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78150 + ... + 78509.

It is an arithmetic number, because the mean of its divisors is an integer number (2376010).

Almost surely, 2^28198620 is an apocalyptic number.

28198620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28198620 is an abundant number, since it is smaller than the sum of its proper divisors (57337740).

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

28198620 is a wasteful number, since it uses less digits than its factorization.

28198620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156674 (or 156669 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28198620 is about 5310.2372828340. The cubic root of 28198620 is about 304.3752147904.

The spelling of 28198620 in words is "twenty-eight million, one hundred ninety-eight thousand, six hundred twenty".