28274431 has 2 divisors, whose sum is σ = 28274432. Its totient is φ = 28274430.

The previous prime is 28274381. The next prime is 28274437. The reversal of 28274431 is 13447282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28274431 - 2¹¹ = 28272383 is a prime.

It is a super-2 number, since 2×28274431² = 1598886896747522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28274393 and 28274402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28274437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137215 + 14137216.

It is an arithmetic number, because the mean of its divisors is an integer number (14137216).

Almost surely, 2^28274431 is an apocalyptic number.

28274431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28274431 is an equidigital number, since it uses as much as digits as its factorization.

28274431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 28274431 is about 5317.3706848404. The cubic root of 28274431 is about 304.6477380732.

The spelling of 28274431 in words is "twenty-eight million, two hundred seventy-four thousand, four hundred thirty-one".