3240720 has 120 divisors (see below), whose sum is σ = 12457536. Its totient is φ = 739584.

The previous prime is 3240707. The next prime is 3240733. The reversal of 3240720 is 270423.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3240707) and next prime (3240733).

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×3240720² = 21004532236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 3240693 and 3240702.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4719 + ... + 5361.

Almost surely, 2^3240720 is an apocalyptic number.

3240720 is a gapful number since it is divisible by the number (30) 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 3240720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6228768).

3240720 is an abundant number, since it is smaller than the sum of its proper divisors (9216816).

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

3240720 is a wasteful number, since it uses less digits than its factorization.

3240720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 3240720 is about 1800.1999888901. The cubic root of 3240720 is about 147.9836845906.

The spelling of 3240720 in words is "three million, two hundred forty thousand, seven hundred twenty".