997566880 has 96 divisors (see below), whose sum is σ = 2492985600. Its totient is φ = 376169472.

The previous prime is 997566877. The next prime is 997566893. The reversal of 997566880 is 88665799.

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, 725874 + ... + 727246.

It is an arithmetic number, because the mean of its divisors is an integer number (25968600).

Almost surely, 2^997566880 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 997566880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246492800).

997566880 is an abundant number, since it is smaller than the sum of its proper divisors (1495418720).

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

997566880 is a wasteful number, since it uses less digits than its factorization.

997566880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The square root of 997566880 is about 31584.2821669260. The cubic root of 997566880 is about 999.1883013235.

The spelling of 997566880 in words is "nine hundred ninety-seven million, five hundred sixty-six thousand, eight hundred eighty".