28894639 has 2 divisors, whose sum is σ = 28894640. Its totient is φ = 28894638.

The previous prime is 28894637. The next prime is 28894661. The reversal of 28894639 is 93649882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28894639 - 2¹ = 28894637 is a prime.

Together with 28894637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28894592 and 28894601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28894631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14447319 + 14447320.

It is an arithmetic number, because the mean of its divisors is an integer number (14447320).

Almost surely, 2^28894639 is an apocalyptic number.

28894639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28894639 is an equidigital number, since it uses as much as digits as its factorization.

28894639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 49.

The square root of 28894639 is about 5375.3733823801. The cubic root of 28894639 is about 306.8591593678.

The spelling of 28894639 in words is "twenty-eight million, eight hundred ninety-four thousand, six hundred thirty-nine".