28728745892 has 60 divisors (see below), whose sum is σ = 63203750400. Its totient is φ = 11192858160.

The previous prime is 28728745841. The next prime is 28728745933. The reversal of 28728745892 is 29854782782.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 374909 + ... + 444987.

It is an arithmetic number, because the mean of its divisors is an integer number (1053395840).

Almost surely, 2^28728745892 is an apocalyptic number.

28728745892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28728745892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31601875200).

28728745892 is an abundant number, since it is smaller than the sum of its proper divisors (34475004508).

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

28728745892 is an equidigital number, since it uses as much as digits as its factorization.

28728745892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70134 (or 70099 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 62.

The spelling of 28728745892 in words is "twenty-eight billion, seven hundred twenty-eight million, seven hundred forty-five thousand, eight hundred ninety-two".