28581291936 has 60 divisors (see below), whose sum is σ = 84056793282. Its totient is φ = 9527096448.

The previous prime is 28581291919. The next prime is 28581291967. The reversal of 28581291936 is 63919218582.

28581291936 is a `hidden beast` number, since 2 + 8 + 581 + 29 + 1 + 9 + 36 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28276440336 + 304851600 = 168156^2 + 17460^2 .

It is a super-3 number, since 3×28581291936³ (a number of 32 digits) contains 333 as substring.

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

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 5510775 + ... + 5515958.

Almost surely, 2^28581291936 is an apocalyptic number.

It is an amenable number.

28581291936 is an abundant number, since it is smaller than the sum of its proper divisors (55475501346).

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

28581291936 is a wasteful number, since it uses less digits than its factorization.

28581291936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026755 (or 11026738 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 28581291936 in words is "twenty-eight billion, five hundred eighty-one million, two hundred ninety-one thousand, nine hundred thirty-six".