28557199 has 8 divisors (see below), whose sum is σ = 32227920. Its totient is φ = 25065600.

The previous prime is 28557173. The next prime is 28557227. The reversal of 28557199 is 99175582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28557199 is a prime.

It is a super-2 number, since 2×28557199² = 1631027229451202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557119) 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, 44442 + ... + 45079.

It is an arithmetic number, because the mean of its divisors is an integer number (4028490).

Almost surely, 2^28557199 is an apocalyptic number.

28557199 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28557199 is a deficient number, since it is larger than the sum of its proper divisors (3670721).

28557199 is a wasteful number, since it uses less digits than its factorization.

28557199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89561.

The product of its digits is 226800, while the sum is 46.

The square root of 28557199 is about 5343.8936179531. The cubic root of 28557199 is about 305.6599487609.

The spelling of 28557199 in words is "twenty-eight million, five hundred fifty-seven thousand, one hundred ninety-nine".