28090639 has 2 divisors, whose sum is σ = 28090640. Its totient is φ = 28090638.

The previous prime is 28090637. The next prime is 28090663. The reversal of 28090639 is 93609082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28090639 - 2¹ = 28090637 is a prime.

Together with 28090637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28090598 and 28090607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28090633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045319 + 14045320.

It is an arithmetic number, because the mean of its divisors is an integer number (14045320).

Almost surely, 2^28090639 is an apocalyptic number.

28090639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28090639 is an equidigital number, since it uses as much as digits as its factorization.

28090639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 28090639 is about 5300.0602826760. The cubic root of 28090639 is about 303.9862030615.

The spelling of 28090639 in words is "twenty-eight million, ninety thousand, six hundred thirty-nine".