997180992 has 84 divisors (see below), whose sum is σ = 2862734940. Its totient is φ = 331871232.

The previous prime is 997180991. The next prime is 997180997. The reversal of 997180992 is 299081799.

It can be written as a sum of positive squares in 2 ways, for example, as 59351616 + 937829376 = 7704^2 + 30624^2 .

It is a super-2 number, since 2×997180992² = 1988739861612208128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997180991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 582634 + ... + 584342.

Almost surely, 2^997180992 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 997180992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431367470).

997180992 is an abundant number, since it is smaller than the sum of its proper divisors (1865553948).

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

997180992 is a wasteful number, since it uses less digits than its factorization.

997180992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The square root of 997180992 is about 31578.1727147091. The cubic root of 997180992 is about 999.0594463028.

The spelling of 997180992 in words is "nine hundred ninety-seven million, one hundred eighty thousand, nine hundred ninety-two".