28418919 has 8 divisors (see below), whose sum is σ = 38146800. Its totient is φ = 18818496.

The previous prime is 28418911. The next prime is 28418933. The reversal of 28418919 is 91981482.

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

It is not a de Polignac number, because 28418919 - 2³ = 28418911 is a prime.

It is a super-2 number, since 2×28418919² = 1615269914257122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28418911) 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, 31342 + ... + 32235.

It is an arithmetic number, because the mean of its divisors is an integer number (4768350).

Almost surely, 2^28418919 is an apocalyptic number.

28418919 is a deficient number, since it is larger than the sum of its proper divisors (9727881).

28418919 is a wasteful number, since it uses less digits than its factorization.

28418919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63729.

The product of its digits is 41472, while the sum is 42.

The square root of 28418919 is about 5330.9397858164. The cubic root of 28418919 is about 305.1657935837.

The spelling of 28418919 in words is "twenty-eight million, four hundred eighteen thousand, nine hundred nineteen".