28945911637 has 2 divisors, whose sum is σ = 28945911638. Its totient is φ = 28945911636.

The previous prime is 28945911619. The next prime is 28945911647. The reversal of 28945911637 is 73611954982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27436278321 + 1509633316 = 165639^2 + 38854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28945911637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28945911647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14472955818 + 14472955819.

It is an arithmetic number, because the mean of its divisors is an integer number (14472955819).

Almost surely, 2^28945911637 is an apocalyptic number.

It is an amenable number.

28945911637 is a deficient number, since it is larger than the sum of its proper divisors (1).

28945911637 is an equidigital number, since it uses as much as digits as its factorization.

28945911637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 28945911637 in words is "twenty-eight billion, nine hundred forty-five million, nine hundred eleven thousand, six hundred thirty-seven".