28743391020 has 24 divisors (see below), whose sum is σ = 80481495024. Its totient is φ = 7664904256.

The previous prime is 28743391009. The next prime is 28743391073. The reversal of 28743391020 is 2019334782.

It is a self number, because there is not a number n which added to its sum of digits gives 28743391020.

It is an unprimeable number.

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, 239528199 + ... + 239528318.

It is an arithmetic number, because the mean of its divisors is an integer number (3353395626).

Almost surely, 2^28743391020 is an apocalyptic number.

28743391020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28743391020 is an abundant number, since it is smaller than the sum of its proper divisors (51738104004).

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

28743391020 is a wasteful number, since it uses less digits than its factorization.

28743391020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479056529 (or 479056527 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 28743391020 in words is "twenty-eight billion, seven hundred forty-three million, three hundred ninety-one thousand, twenty".