28102907 has 16 divisors (see below), whose sum is σ = 32947200. Its totient is φ = 23474880.

The previous prime is 28102903. The next prime is 28102909. The reversal of 28102907 is 70920182.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28102907 - 2² = 28102903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28102907.

It is not an unprimeable number, because it can be changed into a prime (28102903) 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, 48932 + ... + 49502.

It is an arithmetic number, because the mean of its divisors is an integer number (2059200).

Almost surely, 2^28102907 is an apocalyptic number.

28102907 is a deficient number, since it is larger than the sum of its proper divisors (4844293).

28102907 is an equidigital number, since it uses as much as digits as its factorization.

28102907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 28102907 is about 5301.2175016688. The cubic root of 28102907 is about 304.0304498297.

The spelling of 28102907 in words is "twenty-eight million, one hundred two thousand, nine hundred seven".