28655237791 has 16 divisors (see below), whose sum is σ = 30798835200. Its totient is φ = 26564174208.

The previous prime is 28655237777. The next prime is 28655237803. The reversal of 28655237791 is 19773255682.

It is a cyclic number.

It is not a de Polignac number, because 28655237791 - 2⁵ = 28655237759 is a prime.

It is a super-2 number, since 2×28655237791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655237291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537256 + ... + 588178.

It is an arithmetic number, because the mean of its divisors is an integer number (1924927200).

Almost surely, 2^28655237791 is an apocalyptic number.

28655237791 is a deficient number, since it is larger than the sum of its proper divisors (2143597409).

28655237791 is a wasteful number, since it uses less digits than its factorization.

28655237791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51438.

The product of its digits is 6350400, while the sum is 55.

The spelling of 28655237791 in words is "twenty-eight billion, six hundred fifty-five million, two hundred thirty-seven thousand, seven hundred ninety-one".