997685760 has 160 divisors (see below), whose sum is σ = 3276611712. Its totient is φ = 258785280.

The previous prime is 997685719. The next prime is 997685791. The reversal of 997685760 is 67586799.

It is a tau number, because it is divible by the number of its divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 997685760.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282405 + ... + 285915.

Almost surely, 2^997685760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997685760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638305856).

997685760 is an abundant number, since it is smaller than the sum of its proper divisors (2278925952).

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

997685760 is a wasteful number, since it uses less digits than its factorization.

997685760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3574 (or 3558 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 57.

The square root of 997685760 is about 31586.1640596005. The cubic root of 997685760 is about 999.2279908219.

The spelling of 997685760 in words is "nine hundred ninety-seven million, six hundred eighty-five thousand, seven hundred sixty".