28406647 has 2 divisors, whose sum is σ = 28406648. Its totient is φ = 28406646.

The previous prime is 28406641. The next prime is 28406699. The reversal of 28406647 is 74660482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28406647 - 2⁷ = 28406519 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28406641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203323 + 14203324.

It is an arithmetic number, because the mean of its divisors is an integer number (14203324).

Almost surely, 2^28406647 is an apocalyptic number.

28406647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406647 is an equidigital number, since it uses as much as digits as its factorization.

28406647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 28406647 is about 5329.7886449652. The cubic root of 28406647 is about 305.1218611854.

The spelling of 28406647 in words is "twenty-eight million, four hundred six thousand, six hundred forty-seven".