28444431 has 16 divisors (see below), whose sum is σ = 38776320. Its totient is φ = 18541440.

The previous prime is 28444421. The next prime is 28444433. The reversal of 28444431 is 13444482.

It is not a de Polignac number, because 28444431 - 2⁷ = 28444303 is a prime.

It is a super-2 number, since 2×28444431² = 1618171309827522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47671 + ... + 48263.

It is an arithmetic number, because the mean of its divisors is an integer number (2423520).

Almost surely, 2^28444431 is an apocalyptic number.

28444431 is a deficient number, since it is larger than the sum of its proper divisors (10331889).

28444431 is a wasteful number, since it uses less digits than its factorization.

28444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926.

The product of its digits is 12288, while the sum is 30.

The square root of 28444431 is about 5333.3320729165. The cubic root of 28444431 is about 305.2570832537.

The spelling of 28444431 in words is "twenty-eight million, four hundred forty-four thousand, four hundred thirty-one".