28919469 has 8 divisors (see below), whose sum is σ = 38594560. Its totient is φ = 19262016.

The previous prime is 28919453. The next prime is 28919479. The reversal of 28919469 is 96491982.

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

It is not a de Polignac number, because 28919469 - 2⁴ = 28919453 is a prime.

It is a super-2 number, since 2×28919469² = 1672671374483922, 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 (28919479) 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, 69 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (4824320).

Almost surely, 2^28919469 is an apocalyptic number.

It is an amenable number.

28919469 is a deficient number, since it is larger than the sum of its proper divisors (9675091).

28919469 is a wasteful number, since it uses less digits than its factorization.

28919469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8819.

The product of its digits is 279936, while the sum is 48.

The square root of 28919469 is about 5377.6824934167. The cubic root of 28919469 is about 306.9470318559.

The spelling of 28919469 in words is "twenty-eight million, nine hundred nineteen thousand, four hundred sixty-nine".