28307647 has 2 divisors, whose sum is σ = 28307648. Its totient is φ = 28307646.

The previous prime is 28307639. The next prime is 28307651. The reversal of 28307647 is 74670382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28307647 - 2³ = 28307639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28307047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153823 + 14153824.

It is an arithmetic number, because the mean of its divisors is an integer number (14153824).

Almost surely, 2^28307647 is an apocalyptic number.

28307647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28307647 is an equidigital number, since it uses as much as digits as its factorization.

28307647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 28307647 is about 5320.4931162440. The cubic root of 28307647 is about 304.7669885634.

The spelling of 28307647 in words is "twenty-eight million, three hundred seven thousand, six hundred forty-seven".