28791276 has 12 divisors (see below), whose sum is σ = 67179672. Its totient is φ = 9597088.

The previous prime is 28791271. The next prime is 28791277. The reversal of 28791276 is 67219782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28791271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199625 + ... + 1199648.

It is an arithmetic number, because the mean of its divisors is an integer number (5598306).

Almost surely, 2^28791276 is an apocalyptic number.

It is an amenable number.

28791276 is an abundant number, since it is smaller than the sum of its proper divisors (38388396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28791276 is a wasteful number, since it uses less digits than its factorization.

28791276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399280 (or 2399278 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 28791276 is about 5365.7502737269. The cubic root of 28791276 is about 306.4928194452.

The spelling of 28791276 in words is "twenty-eight million, seven hundred ninety-one thousand, two hundred seventy-six".