28301639 has 2 divisors, whose sum is σ = 28301640. Its totient is φ = 28301638.

The previous prime is 28301627. The next prime is 28301653. The reversal of 28301639 is 93610382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28301639 - 2²⁰ = 27253063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28307639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14150819 + 14150820.

It is an arithmetic number, because the mean of its divisors is an integer number (14150820).

Almost surely, 2^28301639 is an apocalyptic number.

28301639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28301639 is an equidigital number, since it uses as much as digits as its factorization.

28301639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28301639 is about 5319.9284769628. The cubic root of 28301639 is about 304.7454258432.

The spelling of 28301639 in words is "twenty-eight million, three hundred one thousand, six hundred thirty-nine".