28714891 has 4 divisors (see below), whose sum is σ = 28758232. Its totient is φ = 28671552.

The previous prime is 28714859. The next prime is 28714913. The reversal of 28714891 is 19841782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28714891 - 2⁵ = 28714859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28714831) 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, 20661 + ... + 22006.

It is an arithmetic number, because the mean of its divisors is an integer number (7189558).

Almost surely, 2^28714891 is an apocalyptic number.

28714891 is a deficient number, since it is larger than the sum of its proper divisors (43341).

28714891 is an equidigital number, since it uses as much as digits as its factorization.

28714891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43340.

The product of its digits is 32256, while the sum is 40.

The square root of 28714891 is about 5358.6277161229. The cubic root of 28714891 is about 306.2215313812.

The spelling of 28714891 in words is "twenty-eight million, seven hundred fourteen thousand, eight hundred ninety-one".