28944775 has 6 divisors (see below), whose sum is σ = 35891552. Its totient is φ = 23155800.

The previous prime is 28944763. The next prime is 28944779. The reversal of 28944775 is 57744982.

It is not a de Polignac number, because 28944775 - 2⁹ = 28944263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28944779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 578871 + ... + 578920.

Almost surely, 2^28944775 is an apocalyptic number.

28944775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28944775 is a deficient number, since it is larger than the sum of its proper divisors (6946777).

28944775 is a wasteful number, since it uses less digits than its factorization.

28944775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157801 (or 1157796 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 28944775 is about 5380.0348511882. The cubic root of 28944775 is about 307.0365371532.

The spelling of 28944775 in words is "twenty-eight million, nine hundred forty-four thousand, seven hundred seventy-five".