997644480 has 224 divisors, whose sum is σ = 3737579520. Its totient is φ = 220631040.

The previous prime is 997644421. The next prime is 997644491. The reversal of 997644480 is 84446799.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205926 + ... + 210714.

Almost surely, 2^997644480 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 997644480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868789760).

997644480 is an abundant number, since it is smaller than the sum of its proper divisors (2739935040).

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

997644480 is a wasteful number, since it uses less digits than its factorization.

997644480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 997644480 is about 31585.5106021733. The cubic root of 997644480 is about 999.2142093615.

The spelling of 997644480 in words is "nine hundred ninety-seven million, six hundred forty-four thousand, four hundred eighty".