1028172956240 has 20 divisors (see below), whose sum is σ = 2390502123444. Its totient is φ = 411269182464.

The previous prime is 1028172956231. The next prime is 1028172956333. The reversal of 1028172956240 is 426592718201.

It can be written as a sum of positive squares in 2 ways, for example, as 820415669824 + 207757286416 = 905768^2 + 455804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6426080897 + ... + 6426081056.

Almost surely, 2^{1028172956240} is an apocalyptic number.

1028172956240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028172956240 is an abundant number, since it is smaller than the sum of its proper divisors (1362329167204).

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

1028172956240 is a wasteful number, since it uses less digits than its factorization.

1028172956240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12852161966 (or 12852161960 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 1028172956240 in words is "one trillion, twenty-eight billion, one hundred seventy-two million, nine hundred fifty-six thousand, two hundred forty".