28274551 has 2 divisors, whose sum is σ = 28274552. Its totient is φ = 28274550.

The previous prime is 28274509. The next prime is 28274569. The reversal of 28274551 is 15547282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28274551 - 2¹⁹ = 27750263 is a prime.

It is equal to p_1757464 and since 28274551 and 1757464 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28274581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137275 + 14137276.

It is an arithmetic number, because the mean of its divisors is an integer number (14137276).

Almost surely, 2^28274551 is an apocalyptic number.

28274551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28274551 is an equidigital number, since it uses as much as digits as its factorization.

28274551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 34.

The square root of 28274551 is about 5317.3819686007. The cubic root of 28274551 is about 304.6481690595.

The spelling of 28274551 in words is "twenty-eight million, two hundred seventy-four thousand, five hundred fifty-one".