6990720 has 128 divisors (see below), whose sum is σ = 24382080. Its totient is φ = 1689600.

The previous prime is 6990703. The next prime is 6990721. The reversal of 6990720 is 270996.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×6990720² = 97740332236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20955 + ... + 21285.

It is an arithmetic number, because the mean of its divisors is an integer number (190485).

Almost surely, 2^6990720 is an apocalyptic number.

6990720 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 6990720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12191040).

6990720 is an abundant number, since it is smaller than the sum of its proper divisors (17391360).

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

6990720 is a wasteful number, since it uses less digits than its factorization.

6990720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 6990720 is about 2643.9969742797. The cubic root of 6990720 is about 191.2085475541.

The spelling of 6990720 in words is "six million, nine hundred ninety thousand, seven hundred twenty".