6990397440 has 272 divisors, whose sum is σ = 24133841088. Its totient is φ = 1717567488.

The previous prime is 6990397417. The next prime is 6990397451. The reversal of 6990397440 is 447930996.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12779247 + ... + 12779793.

Almost surely, 2^6990397440 is an apocalyptic number.

6990397440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6990397440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12066920544).

6990397440 is an abundant number, since it is smaller than the sum of its proper divisors (17143443648).

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

6990397440 is an equidigital number, since it uses as much as digits as its factorization.

6990397440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 6990397440 is about 83608.5966871828. The cubic root of 6990397440 is about 1912.0560664686.

The spelling of 6990397440 in words is "six billion, nine hundred ninety million, three hundred ninety-seven thousand, four hundred forty".