28531457684 has 24 divisors (see below), whose sum is σ = 50978800320. Its totient is φ = 13968637056.

The previous prime is 28531457681. The next prime is 28531457699. The reversal of 28531457684 is 48675413582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531457681) 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 7 ways as a sum of consecutive naturals, for example, 273989 + ... + 363500.

It is an arithmetic number, because the mean of its divisors is an integer number (2124116680).

Almost surely, 2^28531457684 is an apocalyptic number.

It is an amenable number.

28531457684 is a deficient number, since it is larger than the sum of its proper divisors (22447342636).

28531457684 is a wasteful number, since it uses less digits than its factorization.

28531457684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637727 (or 637725 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The spelling of 28531457684 in words is "twenty-eight billion, five hundred thirty-one million, four hundred fifty-seven thousand, six hundred eighty-four".