28328407 has 2 divisors, whose sum is σ = 28328408. Its totient is φ = 28328406.

The previous prime is 28328401. The next prime is 28328423. The reversal of 28328407 is 70482382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28328407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28328401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14164203 + 14164204.

It is an arithmetic number, because the mean of its divisors is an integer number (14164204).

Almost surely, 2^28328407 is an apocalyptic number.

28328407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28328407 is an equidigital number, since it uses as much as digits as its factorization.

28328407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 28328407 is about 5322.4437056675. The cubic root of 28328407 is about 304.8414727554.

The spelling of 28328407 in words is "twenty-eight million, three hundred twenty-eight thousand, four hundred seven".