3621728 has 24 divisors (see below), whose sum is σ = 7779240. Its totient is φ = 1646080.

The previous prime is 3621727. The next prime is 3621733. The reversal of 3621728 is 8271263.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3621728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4793 + ... + 5496.

It is an arithmetic number, because the mean of its divisors is an integer number (324135).

Almost surely, 2^3621728 is an apocalyptic number.

It is an amenable number.

3621728 is an abundant number, since it is smaller than the sum of its proper divisors (4157512).

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

3621728 is a wasteful number, since it uses less digits than its factorization.

3621728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310 (or 10302 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 3621728 is about 1903.0838131832. The cubic root of 3621728 is about 153.5696084257.

The spelling of 3621728 in words is "three million, six hundred twenty-one thousand, seven hundred twenty-eight".