1697256289728 has 224 divisors, whose sum is σ = 5074017792000. Its totient is φ = 556242785280.

The previous prime is 1697256289727. The next prime is 1697256289741. The reversal of 1697256289728 is 8279826527961.

1697256289728 is a `hidden beast` number, since 1 + 6 + 97 + 256 + 289 + 7 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1697256289723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32600358 + ... + 32652378.

Almost surely, 2^{1697256289728} is an apocalyptic number.

1697256289728 is a gapful number since it is divisible by the number (18) 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 1697256289728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2537008896000).

1697256289728 is an abundant number, since it is smaller than the sum of its proper divisors (3376761502272).

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

1697256289728 is a wasteful number, since it uses less digits than its factorization.

1697256289728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52360 (or 52344 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 72.

The spelling of 1697256289728 in words is "one trillion, six hundred ninety-seven billion, two hundred fifty-six million, two hundred eighty-nine thousand, seven hundred twenty-eight".