28818444 has 12 divisors (see below), whose sum is σ = 67243064. Its totient is φ = 9606144.

The previous prime is 28818407. The next prime is 28818457. The reversal of 28818444 is 44481882.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28818444² = 1661005429162272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200757 + ... + 1200780.

Almost surely, 2^28818444 is an apocalyptic number.

It is an amenable number.

28818444 is an abundant number, since it is smaller than the sum of its proper divisors (38424620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28818444 is a wasteful number, since it uses less digits than its factorization.

28818444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401544 (or 2401542 counting only the distinct ones).

The product of its digits is 65536, while the sum is 39.

The square root of 28818444 is about 5368.2812892023. The cubic root of 28818444 is about 306.5891933050.

It can be divided in two parts, 2881 and 8444, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 28818444 in words is "twenty-eight million, eight hundred eighteen thousand, four hundred forty-four".