6999720 has 128 divisors (see below), whose sum is σ = 25885440. Its totient is φ = 1474560.

The previous prime is 6999703. The next prime is 6999721. The reversal of 6999720 is 279996.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (6999721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10600 + ... + 11240.

It is an arithmetic number, because the mean of its divisors is an integer number (202230).

Almost surely, 2^6999720 is an apocalyptic number.

6999720 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 6999720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12942720).

6999720 is an abundant number, since it is smaller than the sum of its proper divisors (18885720).

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

6999720 is a wasteful number, since it uses less digits than its factorization.

6999720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 6999720 is about 2645.6983955092. The cubic root of 6999720 is about 191.2905676683.

The spelling of 6999720 in words is "six million, nine hundred ninety-nine thousand, seven hundred twenty".