28130897 has 4 divisors (see below), whose sum is σ = 28219956. Its totient is φ = 28041840.

The previous prime is 28130891. The next prime is 28130911. The reversal of 28130897 is 79803182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3519376 + 24611521 = 1876^2 + 4961^2 .

It is a cyclic number.

It is not a de Polignac number, because 28130897 - 2⁶ = 28130833 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 28130897.

It is not an unprimeable number, because it can be changed into a prime (28130891) 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, 44054 + ... + 44687.

It is an arithmetic number, because the mean of its divisors is an integer number (7054989).

Almost surely, 2^28130897 is an apocalyptic number.

It is an amenable number.

28130897 is a deficient number, since it is larger than the sum of its proper divisors (89059).

28130897 is an equidigital number, since it uses as much as digits as its factorization.

28130897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89058.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28130897 is about 5303.8568042510. The cubic root of 28130897 is about 304.1313526609.

The spelling of 28130897 in words is "twenty-eight million, one hundred thirty thousand, eight hundred ninety-seven".