28425643 has 2 divisors, whose sum is σ = 28425644. Its totient is φ = 28425642.

The previous prime is 28425637. The next prime is 28425671. The reversal of 28425643 is 34652482.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28425643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28425599 and 28425608.

It is not a weakly prime, because it can be changed into another prime (28425673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212821 + 14212822.

It is an arithmetic number, because the mean of its divisors is an integer number (14212822).

Almost surely, 2^28425643 is an apocalyptic number.

28425643 is a deficient number, since it is larger than the sum of its proper divisors (1).

28425643 is an equidigital number, since it uses as much as digits as its factorization.

28425643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 34.

The square root of 28425643 is about 5331.5704065500. The cubic root of 28425643 is about 305.1898593945.

The spelling of 28425643 in words is "twenty-eight million, four hundred twenty-five thousand, six hundred forty-three".