997056840 has 128 divisors (see below), whose sum is σ = 3236486400. Its totient is φ = 244270080.

The previous prime is 997056821. The next prime is 997056883. The reversal of 997056840 is 48650799.

997056840 is a nontrivial binomial coefficient, being equal to C(44656, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 997056840.

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, 355845 + ... + 358635.

It is an arithmetic number, because the mean of its divisors is an integer number (25285050).

Almost surely, 2^997056840 is an apocalyptic number.

997056840 is the 44655-th triangular number and also the 22328-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997056840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1618243200).

997056840 is an abundant number, since it is smaller than the sum of its proper divisors (2239429560).

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

997056840 is a wasteful number, since it uses less digits than its factorization.

997056840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047 (or 3043 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 997056840 is about 31576.2068652965. The cubic root of 997056840 is about 999.0179826242.

The spelling of 997056840 in words is "nine hundred ninety-seven million, fifty-six thousand, eight hundred forty".