28925639 has 2 divisors, whose sum is σ = 28925640. Its totient is φ = 28925638.

The previous prime is 28925629. The next prime is 28925669. The reversal of 28925639 is 93652982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28925639 - 2¹⁶ = 28860103 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28925639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28925629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14462819 + 14462820.

It is an arithmetic number, because the mean of its divisors is an integer number (14462820).

Almost surely, 2^28925639 is an apocalyptic number.

28925639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28925639 is an equidigital number, since it uses as much as digits as its factorization.

28925639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 28925639 is about 5378.2561300109. The cubic root of 28925639 is about 306.9688594641.

The spelling of 28925639 in words is "twenty-eight million, nine hundred twenty-five thousand, six hundred thirty-nine".