28840478893 has 2 divisors, whose sum is σ = 28840478894. Its totient is φ = 28840478892.

The previous prime is 28840478819. The next prime is 28840478897. The reversal of 28840478893 is 39887404882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20898460969 + 7942017924 = 144563^2 + 89118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28840478893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28840478897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14420239446 + 14420239447.

It is an arithmetic number, because the mean of its divisors is an integer number (14420239447).

Almost surely, 2^28840478893 is an apocalyptic number.

It is an amenable number.

28840478893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28840478893 is an equidigital number, since it uses as much as digits as its factorization.

28840478893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24772608, while the sum is 61.

The spelling of 28840478893 in words is "twenty-eight billion, eight hundred forty million, four hundred seventy-eight thousand, eight hundred ninety-three".