3180728 has 8 divisors (see below), whose sum is σ = 5963880. Its totient is φ = 1590360.

The previous prime is 3180721. The next prime is 3180757. The reversal of 3180728 is 8270813.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 3180728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3180721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198788 + ... + 198803.

It is an arithmetic number, because the mean of its divisors is an integer number (745485).

Almost surely, 2^3180728 is an apocalyptic number.

It is an amenable number.

3180728 is a deficient number, since it is larger than the sum of its proper divisors (2783152).

3180728 is a wasteful number, since it uses less digits than its factorization.

3180728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397597 (or 397593 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 3180728 is about 1783.4595593957. The cubic root of 3180728 is about 147.0648363471.

The spelling of 3180728 in words is "three million, one hundred eighty thousand, seven hundred twenty-eight".