3120728 has 32 divisors (see below), whose sum is σ = 6479760. Its totient is φ = 1399680.

The previous prime is 3120727. The next prime is 3120757. The reversal of 3120728 is 8270213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3120727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3443 + ... + 4253.

Almost surely, 2^3120728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3120728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3239880).

3120728 is an abundant number, since it is smaller than the sum of its proper divisors (3359032).

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

3120728 is a wasteful number, since it uses less digits than its factorization.

3120728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 3120728 is about 1766.5582356662. The cubic root of 3120728 is about 146.1342357096.

The spelling of 3120728 in words is "three million, one hundred twenty thousand, seven hundred twenty-eight".