28279451 has 2 divisors, whose sum is σ = 28279452. Its totient is φ = 28279450.

The previous prime is 28279441. The next prime is 28279453. The reversal of 28279451 is 15497282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28279451 - 2⁶ = 28279387 is a prime.

It is a super-2 number, since 2×28279451² = 1599454697722802, which contains 22 as substring.

Together with 28279453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28279453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14139725 + 14139726.

It is an arithmetic number, because the mean of its divisors is an integer number (14139726).

Almost surely, 2^28279451 is an apocalyptic number.

28279451 is a deficient number, since it is larger than the sum of its proper divisors (1).

28279451 is an equidigital number, since it uses as much as digits as its factorization.

28279451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 28279451 is about 5317.8427016977. The cubic root of 28279451 is about 304.6657666251.

The spelling of 28279451 in words is "twenty-eight million, two hundred seventy-nine thousand, four hundred fifty-one".