28744775 has 12 divisors (see below), whose sum is σ = 36046800. Its totient is φ = 22735680.

The previous prime is 28744759. The next prime is 28744789. The reversal of 28744775 is 57744782.

It is not a de Polignac number, because 28744775 - 2⁴ = 28744759 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4235 + ... + 8684.

It is an arithmetic number, because the mean of its divisors is an integer number (3003900).

Almost surely, 2^28744775 is an apocalyptic number.

28744775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28744775 is a deficient number, since it is larger than the sum of its proper divisors (7302025).

28744775 is a wasteful number, since it uses less digits than its factorization.

28744775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13018 (or 13013 counting only the distinct ones).

The product of its digits is 439040, while the sum is 44.

The square root of 28744775 is about 5361.4153914801. The cubic root of 28744775 is about 306.3277242680.

The spelling of 28744775 in words is "twenty-eight million, seven hundred forty-four thousand, seven hundred seventy-five".