28775979 has 20 divisors (see below), whose sum is σ = 43803936. Its totient is φ = 18819216.

The previous prime is 28775977. The next prime is 28775993. The reversal of 28775979 is 97957782.

It is not a de Polignac number, because 28775979 - 2¹ = 28775977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28775977) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 942 + ... + 7644.

Almost surely, 2^28775979 is an apocalyptic number.

28775979 is a deficient number, since it is larger than the sum of its proper divisors (15027957).

28775979 is an equidigital number, since it uses as much as digits as its factorization.

28775979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6768 (or 6759 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 28775979 is about 5364.3246546047. The cubic root of 28775979 is about 306.4385292587.

The spelling of 28775979 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred seventy-nine".