997044640 has 24 divisors (see below), whose sum is σ = 2355518340. Its totient is φ = 398817792.

The previous prime is 997044623. The next prime is 997044647. The reversal of 997044640 is 46440799.

It can be written as a sum of positive squares in 2 ways, for example, as 846344464 + 150700176 = 29092^2 + 12276^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (997044647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3115605 + ... + 3115924.

Almost surely, 2^997044640 is an apocalyptic number.

It is an amenable number.

997044640 is an abundant number, since it is smaller than the sum of its proper divisors (1358473700).

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

997044640 is a wasteful number, since it uses less digits than its factorization.

997044640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231544 (or 6231536 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 997044640 is about 31576.0136812740. The cubic root of 997044640 is about 999.0139079421.

The spelling of 997044640 in words is "nine hundred ninety-seven million, forty-four thousand, six hundred forty".