28311279 has 16 divisors (see below), whose sum is σ = 40007520. Its totient is φ = 17776640.

The previous prime is 28311271. The next prime is 28311313. The reversal of 28311279 is 97211382.

It is a cyclic number.

It is not a de Polignac number, because 28311279 - 2³ = 28311271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311271) 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, 402 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (2500470).

Almost surely, 2^28311279 is an apocalyptic number.

28311279 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28311279 is a deficient number, since it is larger than the sum of its proper divisors (11696241).

28311279 is a wasteful number, since it uses less digits than its factorization.

28311279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8010.

The product of its digits is 6048, while the sum is 33.

The square root of 28311279 is about 5320.8344270424. The cubic root of 28311279 is about 304.7800223368.

The spelling of 28311279 in words is "twenty-eight million, three hundred eleven thousand, two hundred seventy-nine".