28731345888 has 48 divisors (see below), whose sum is σ = 86194039680. Its totient is φ = 8208955776.

The previous prime is 28731345887. The next prime is 28731345959. The reversal of 28731345888 is 88854313782.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731345887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21376818 + ... + 21378161.

It is an arithmetic number, because the mean of its divisors is an integer number (1795709160).

Almost surely, 2^28731345888 is an apocalyptic number.

28731345888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28731345888 is an abundant number, since it is smaller than the sum of its proper divisors (57462693792).

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

28731345888 is a wasteful number, since it uses less digits than its factorization.

28731345888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42754999 (or 42754991 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 57.

The spelling of 28731345888 in words is "twenty-eight billion, seven hundred thirty-one million, three hundred forty-five thousand, eight hundred eighty-eight".