1997598720 has 416 divisors, whose sum is σ = 7166666304. Its totient is φ = 471859200.

The previous prime is 1997598709. The next prime is 1997598749. The reversal of 1997598720 is 278957991.

It is a tau number, because it is divible by the number of its divisors (416).

It is a super-2 number, since 2×1997598720² = 7980801292291276800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32747490 + ... + 32747550.

Almost surely, 2^1997598720 is an apocalyptic number.

1997598720 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 1997598720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3583333152).

1997598720 is an abundant number, since it is smaller than the sum of its proper divisors (5169067584).

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

1997598720 is a wasteful number, since it uses less digits than its factorization.

1997598720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 57.

The square root of 1997598720 is about 44694.5043601560. The cubic root of 1997598720 is about 1259.4166107546.

The spelling of 1997598720 in words is "one billion, nine hundred ninety-seven million, five hundred ninety-eight thousand, seven hundred twenty".