28541807644 has 24 divisors (see below), whose sum is σ = 57466735200. Its totient is φ = 12150106176.

The previous prime is 28541807639. The next prime is 28541807647. The reversal of 28541807644 is 44670814582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28541807647) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3416467 + ... + 3424810.

It is an arithmetic number, because the mean of its divisors is an integer number (2394447300).

Almost surely, 2^28541807644 is an apocalyptic number.

It is an amenable number.

28541807644 is an abundant number, since it is smaller than the sum of its proper divisors (28924927556).

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

28541807644 is a wasteful number, since it uses less digits than its factorization.

28541807644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6841437 (or 6841435 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 28541807644 in words is "twenty-eight billion, five hundred forty-one million, eight hundred seven thousand, six hundred forty-four".