1028705552500 has 120 divisors (see below), whose sum is σ = 2373806388800. Its totient is φ = 388864800000.

The previous prime is 1028705552473. The next prime is 1028705552509. The reversal of 1028705552500 is 52555078201.

It is a super-2 number, since 2×1028705552500² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028705552509) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19401025 + ... + 19453975.

Almost surely, 2^{1028705552500} is an apocalyptic number.

1028705552500 is a gapful number since it is divisible by the number (10) 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 1028705552500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1186903194400).

1028705552500 is an abundant number, since it is smaller than the sum of its proper divisors (1345100836300).

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

1028705552500 is a wasteful number, since it uses less digits than its factorization.

1028705552500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53403 (or 53386 counting only the distinct ones).

The product of its (nonzero) digits is 140000, while the sum is 40.

The spelling of 1028705552500 in words is "one trillion, twenty-eight billion, seven hundred five million, five hundred fifty-two thousand, five hundred".