28349639 has 6 divisors (see below), whose sum is σ = 29636376. Its totient is φ = 27116540.

The previous prime is 28349611. The next prime is 28349663. The reversal of 28349639 is 93694382.

It is not a de Polignac number, because 28349639 - 2⁸ = 28349383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28349639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28349239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26267 + ... + 27324.

It is an arithmetic number, because the mean of its divisors is an integer number (4939396).

Almost surely, 2^28349639 is an apocalyptic number.

28349639 is a deficient number, since it is larger than the sum of its proper divisors (1286737).

28349639 is an equidigital number, since it uses as much as digits as its factorization.

28349639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53637 (or 53614 counting only the distinct ones).

The product of its digits is 279936, while the sum is 44.

The square root of 28349639 is about 5324.4379046055. The cubic root of 28349639 is about 304.9176127917.

The spelling of 28349639 in words is "twenty-eight million, three hundred forty-nine thousand, six hundred thirty-nine".