28556919 has 6 divisors (see below), whose sum is σ = 41248896. Its totient is φ = 19037940.

The previous prime is 28556917. The next prime is 28556929. The reversal of 28556919 is 91965582.

28556919 is a `hidden beast` number, since 2 + 8 + 556 + 91 + 9 = 666.

It is not a de Polignac number, because 28556919 - 2¹ = 28556917 is a prime.

It is a super-2 number, since 2×28556919² = 1630995245545122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28556917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1586487 + ... + 1586504.

It is an arithmetic number, because the mean of its divisors is an integer number (6874816).

Almost surely, 2^28556919 is an apocalyptic number.

28556919 is a deficient number, since it is larger than the sum of its proper divisors (12691977).

28556919 is a wasteful number, since it uses less digits than its factorization.

28556919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172997 (or 3172994 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 28556919 is about 5343.8674197626. The cubic root of 28556919 is about 305.6589497710.

The spelling of 28556919 in words is "twenty-eight million, five hundred fifty-six thousand, nine hundred nineteen".