28405765368 has 64 divisors (see below), whose sum is σ = 79628868000. Its totient is φ = 9381712896.

The previous prime is 28405765363. The next prime is 28405765397. The reversal of 28405765368 is 86356750482.

28405765368 is a `hidden beast` number, since 2 + 8 + 4 + 0 + 576 + 5 + 3 + 68 = 666.

It is a super-2 number, since 2×28405765368² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405765363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579705 + ... + 626792.

Almost surely, 2^28405765368 is an apocalyptic number.

It is an amenable number.

28405765368 is an abundant number, since it is smaller than the sum of its proper divisors (51223102632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28405765368 is a wasteful number, since it uses less digits than its factorization.

28405765368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206621 (or 1206611 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 28405765368 in words is "twenty-eight billion, four hundred five million, seven hundred sixty-five thousand, three hundred sixty-eight".