28290878591 has 2 divisors, whose sum is σ = 28290878592. Its totient is φ = 28290878590.

The previous prime is 28290878569. The next prime is 28290878633. The reversal of 28290878591 is 19587809282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28290878591 - 2²² = 28286684287 is a prime.

It is a super-2 number, since 2×28290878591² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28290878591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28290872591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14145439295 + 14145439296.

It is an arithmetic number, because the mean of its divisors is an integer number (14145439296).

Almost surely, 2^28290878591 is an apocalyptic number.

28290878591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28290878591 is an equidigital number, since it uses as much as digits as its factorization.

28290878591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The spelling of 28290878591 in words is "twenty-eight billion, two hundred ninety million, eight hundred seventy-eight thousand, five hundred ninety-one".