28336825640 has 32 divisors (see below), whose sum is σ = 64126415880. Its totient is φ = 11269208832.

The previous prime is 28336825639. The next prime is 28336825687. The reversal of 28336825640 is 4652863382.

It can be written as a sum of positive squares in 4 ways, for example, as 20660612644 + 7676212996 = 143738^2 + 87614^2 .

It is a super-2 number, since 2×28336825640² (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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2040539 + ... + 2054378.

Almost surely, 2^28336825640 is an apocalyptic number.

28336825640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28336825640 is an abundant number, since it is smaller than the sum of its proper divisors (35789590240).

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

28336825640 is a wasteful number, since it uses less digits than its factorization.

28336825640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095101 (or 4095097 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 28336825640 in words is "twenty-eight billion, three hundred thirty-six million, eight hundred twenty-five thousand, six hundred forty".