28248691 has 2 divisors, whose sum is σ = 28248692. Its totient is φ = 28248690.

The previous prime is 28248683. The next prime is 28248707. The reversal of 28248691 is 19684282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28248691 - 2³ = 28248683 is a prime.

It is a super-3 number, since 3×28248691³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28248601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124345 + 14124346.

It is an arithmetic number, because the mean of its divisors is an integer number (14124346).

Almost surely, 2^28248691 is an apocalyptic number.

28248691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28248691 is an equidigital number, since it uses as much as digits as its factorization.

28248691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 28248691 is about 5314.9497645792. The cubic root of 28248691 is about 304.5552633144. Note that the first 3 decimals are identical.

The spelling of 28248691 in words is "twenty-eight million, two hundred forty-eight thousand, six hundred ninety-one".