28889907506791 has 2 divisors, whose sum is σ = 28889907506792. Its totient is φ = 28889907506790.

The previous prime is 28889907506743. The next prime is 28889907506819. The reversal of 28889907506791 is 19760570998882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28889907506791 - 2⁹ = 28889907506279 is a prime.

It is a super-2 number, since 2×28889907506791² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28889907506711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14444953753395 + 14444953753396.

It is an arithmetic number, because the mean of its divisors is an integer number (14444953753396).

Almost surely, 2^{28889907506791} is an apocalyptic number.

28889907506791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28889907506791 is an equidigital number, since it uses as much as digits as its factorization.

28889907506791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1097349120, while the sum is 79.

The spelling of 28889907506791 in words is "twenty-eight trillion, eight hundred eighty-nine billion, nine hundred seven million, five hundred six thousand, seven hundred ninety-one".