28564919 has 8 divisors (see below), whose sum is σ = 30769152. Its totient is φ = 26440920.

The previous prime is 28564891. The next prime is 28564951. The reversal of 28564919 is 91946582.

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

It is a cyclic number.

It is not a de Polignac number, because 28564919 - 2¹² = 28560823 is a prime.

It is a super-2 number, since 2×28564919² = 1631909194953122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28564919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564979) 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, 19319 + ... + 20744.

It is an arithmetic number, because the mean of its divisors is an integer number (3846144).

Almost surely, 2^28564919 is an apocalyptic number.

28564919 is a deficient number, since it is larger than the sum of its proper divisors (2204233).

28564919 is a wasteful number, since it uses less digits than its factorization.

28564919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40117.

The product of its digits is 155520, while the sum is 44.

The square root of 28564919 is about 5344.6158889110. The cubic root of 28564919 is about 305.6874897697.

The spelling of 28564919 in words is "twenty-eight million, five hundred sixty-four thousand, nine hundred nineteen".