28663845749 has 32 divisors (see below), whose sum is σ = 38200135680. Its totient is φ = 20843222400.

The previous prime is 28663845629. The next prime is 28663845757. The reversal of 28663845749 is 94754836682.

It is a de Polignac number, because none of the positive numbers 2^k-28663845749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28663845691 and 28663845700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663845799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124769 + ... + 269990.

It is an arithmetic number, because the mean of its divisors is an integer number (1193754240).

Almost surely, 2^28663845749 is an apocalyptic number.

It is an amenable number.

28663845749 is a deficient number, since it is larger than the sum of its proper divisors (9536289931).

28663845749 is a wasteful number, since it uses less digits than its factorization.

28663845749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394841.

The product of its digits is 69672960, while the sum is 62.

The spelling of 28663845749 in words is "twenty-eight billion, six hundred sixty-three million, eight hundred forty-five thousand, seven hundred forty-nine".