28247407 has 2 divisors, whose sum is σ = 28247408. Its totient is φ = 28247406.

The previous prime is 28247341. The next prime is 28247447. The reversal of 28247407 is 70474282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28247407 - 2²³ = 19858799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28247447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14123703 + 14123704.

It is an arithmetic number, because the mean of its divisors is an integer number (14123704).

Almost surely, 2^28247407 is an apocalyptic number.

28247407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28247407 is an equidigital number, since it uses as much as digits as its factorization.

28247407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 28247407 is about 5314.8289718485. The cubic root of 28247407 is about 304.5506488836.

The spelling of 28247407 in words is "twenty-eight million, two hundred forty-seven thousand, four hundred seven".