28785590764 has 72 divisors (see below), whose sum is σ = 60752135808. Its totient is φ = 11886900480.

The previous prime is 28785590747. The next prime is 28785590773. The reversal of 28785590764 is 46709558782.

It is a super-2 number, since 2×28785590764² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1405542 + ... + 1425874.

It is an arithmetic number, because the mean of its divisors is an integer number (843779664).

Almost surely, 2^28785590764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28785590764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30376067904).

28785590764 is an abundant number, since it is smaller than the sum of its proper divisors (31966545044).

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

28785590764 is a wasteful number, since it uses less digits than its factorization.

28785590764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20615 (or 20606 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 28785590764 in words is "twenty-eight billion, seven hundred eighty-five million, five hundred ninety thousand, seven hundred sixty-four".