28805919 has 8 divisors (see below), whose sum is σ = 40429440. Its totient is φ = 18193176.

The previous prime is 28805893. The next prime is 28805929. The reversal of 28805919 is 91950882.

It is a happy number.

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

It is not a de Polignac number, because 28805919 - 2¹² = 28801823 is a prime.

It is a super-2 number, since 2×28805919² = 1659561938869122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805929) 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, 252627 + ... + 252740.

It is an arithmetic number, because the mean of its divisors is an integer number (5053680).

Almost surely, 2^28805919 is an apocalyptic number.

28805919 is a deficient number, since it is larger than the sum of its proper divisors (11623521).

28805919 is a wasteful number, since it uses less digits than its factorization.

28805919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505389.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28805919 is about 5367.1145879327. The cubic root of 28805919 is about 306.5447705261.

The spelling of 28805919 in words is "twenty-eight million, eight hundred five thousand, nine hundred nineteen".