28131279 has 8 divisors (see below), whose sum is σ = 40918272. Its totient is φ = 17049240.

The previous prime is 28131253. The next prime is 28131283. The reversal of 28131279 is 97213182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28131279 - 2⁷ = 28131151 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 852463 = 28131279 / (2 + 8 + 1 + 3 + 1 + 2 + 7 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426199 + ... + 426264.

It is an arithmetic number, because the mean of its divisors is an integer number (5114784).

Almost surely, 2^28131279 is an apocalyptic number.

28131279 is a deficient number, since it is larger than the sum of its proper divisors (12786993).

28131279 is a wasteful number, since it uses less digits than its factorization.

28131279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852477.

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

The square root of 28131279 is about 5303.8928156591. The cubic root of 28131279 is about 304.1327292925.

The spelling of 28131279 in words is "twenty-eight million, one hundred thirty-one thousand, two hundred seventy-nine".