997161744 has 80 divisors (see below), whose sum is σ = 2651616000. Its totient is φ = 322723968.

The previous prime is 997161733. The next prime is 997161797. The reversal of 997161744 is 447161799.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 997161693 and 997161702.

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, 368107 + ... + 370805.

It is an arithmetic number, because the mean of its divisors is an integer number (33145200).

Almost surely, 2^997161744 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 997161744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325808000).

997161744 is an abundant number, since it is smaller than the sum of its proper divisors (1654454256).

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

997161744 is a wasteful number, since it uses less digits than its factorization.

997161744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932 (or 2926 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 997161744 is about 31577.8679457623. The cubic root of 997161744 is about 999.0530181752.

Subtracting from 997161744 its reverse (447161799), we obtain a palindrome (549999945).

The spelling of 997161744 in words is "nine hundred ninety-seven million, one hundred sixty-one thousand, seven hundred forty-four".