28544427 has 16 divisors (see below), whose sum is σ = 43432480. Its totient is φ = 18514656.

The previous prime is 28544423. The next prime is 28544429. The reversal of 28544427 is 72444582.

It is not a de Polignac number, because 28544427 - 2² = 28544423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28544391 and 28544400.

It is not an unprimeable number, because it can be changed into a prime (28544423) 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, 13288 + ... + 15285.

It is an arithmetic number, because the mean of its divisors is an integer number (2714530).

Almost surely, 2^28544427 is an apocalyptic number.

28544427 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28544427 is a deficient number, since it is larger than the sum of its proper divisors (14888053).

28544427 is a wasteful number, since it uses less digits than its factorization.

28544427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28619 (or 28613 counting only the distinct ones).

The product of its digits is 71680, while the sum is 36.

The square root of 28544427 is about 5342.6984754897. The cubic root of 28544427 is about 305.6143739013.

The spelling of 28544427 in words is "twenty-eight million, five hundred forty-four thousand, four hundred twenty-seven".