28102291 has 8 divisors (see below), whose sum is σ = 32207360. Its totient is φ = 24019848.

The previous prime is 28102289. The next prime is 28102303. The reversal of 28102291 is 19220182.

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

It is a cyclic number.

It is not a de Polignac number, because 28102291 - 2¹ = 28102289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28102201) 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, 2901 + ... + 8038.

It is an arithmetic number, because the mean of its divisors is an integer number (4025920).

Almost surely, 2^28102291 is an apocalyptic number.

28102291 is a deficient number, since it is larger than the sum of its proper divisors (4105069).

28102291 is a wasteful number, since it uses less digits than its factorization.

28102291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11313.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 28102291 is about 5301.1594014895. The cubic root of 28102291 is about 304.0282284210.

The spelling of 28102291 in words is "twenty-eight million, one hundred two thousand, two hundred ninety-one".