28281029639 has 2 divisors, whose sum is σ = 28281029640. Its totient is φ = 28281029638.

The previous prime is 28281029629. The next prime is 28281029663. The reversal of 28281029639 is 93692018282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28281029639 - 2²⁰ = 28279981063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28281029629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140514819 + 14140514820.

It is an arithmetic number, because the mean of its divisors is an integer number (14140514820).

Almost surely, 2^28281029639 is an apocalyptic number.

28281029639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281029639 is an equidigital number, since it uses as much as digits as its factorization.

28281029639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 28281029639 in words is "twenty-eight billion, two hundred eighty-one million, twenty-nine thousand, six hundred thirty-nine".