1662728 has 16 divisors (see below), whose sum is σ = 3282000. Its totient is φ = 787536.

The previous prime is 1662707. The next prime is 1662733. The reversal of 1662728 is 8272661.

1662728 = 142² + 143² + ... + 198².

It is a junction number, because it is equal to n+sod(n) for n = 1662694 and 1662703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5318 + ... + 5621.

It is an arithmetic number, because the mean of its divisors is an integer number (205125).

2^1662728 is an apocalyptic number.

It is an amenable number.

1662728 is a deficient number, since it is larger than the sum of its proper divisors (1619272).

1662728 is a wasteful number, since it uses less digits than its factorization.

1662728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10964 (or 10960 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 1662728 is about 1289.4681073993. The cubic root of 1662728 is about 118.4696403677.

The spelling of 1662728 in words is "one million, six hundred sixty-two thousand, seven hundred twenty-eight".