1285717392828 has 72 divisors (see below), whose sum is σ = 3545587661616. Its totient is φ = 389597644800.

The previous prime is 1285717392787. The next prime is 1285717392829. The reversal of 1285717392828 is 8282937175821.

1285717392828 is a `hidden beast` number, since 1 + 2 + 8 + 571 + 7 + 39 + 2 + 8 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285717392829) 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, 21639850 + ... + 21699182.

It is an arithmetic number, because the mean of its divisors is an integer number (49244273078).

Almost surely, 2^{1285717392828} is an apocalyptic number.

1285717392828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1285717392828 is an abundant number, since it is smaller than the sum of its proper divisors (2259870268788).

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

1285717392828 is a wasteful number, since it uses less digits than its factorization.

1285717392828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114075 (or 114070 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The spelling of 1285717392828 in words is "one trillion, two hundred eighty-five billion, seven hundred seventeen million, three hundred ninety-two thousand, eight hundred twenty-eight".