1028249145220 has 72 divisors (see below), whose sum is σ = 2373781224024. Its totient is φ = 373859904000.

The previous prime is 1028249145211. The next prime is 1028249145223. The reversal of 1028249145220 is 225419428201.

It can be written as a sum of positive squares in 4 ways, for example, as 100529580096 + 927719565124 = 317064^2 + 963182^2 .

It is not an unprimeable number, because it can be changed into a prime (1028249145223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22146430 + ... + 22192810.

It is an arithmetic number, because the mean of its divisors is an integer number (32969183667).

Almost surely, 2^{1028249145220} is an apocalyptic number.

1028249145220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028249145220 is an abundant number, since it is smaller than the sum of its proper divisors (1345532078804).

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

1028249145220 is a wasteful number, since it uses less digits than its factorization.

1028249145220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55573 (or 55560 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 1028249145220 in words is "one trillion, twenty-eight billion, two hundred forty-nine million, one hundred forty-five thousand, two hundred twenty".