2120728 has 8 divisors (see below), whose sum is σ = 3976380. Its totient is φ = 1060360.

The previous prime is 2120693. The next prime is 2120731. The reversal of 2120728 is 8270212.

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

It is a junction number, because it is equal to n+sod(n) for n = 2120699 and 2120708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132538 + ... + 132553.

2^2120728 is an apocalyptic number.

It is an amenable number.

2120728 is a deficient number, since it is larger than the sum of its proper divisors (1855652).

2120728 is a wasteful number, since it uses less digits than its factorization.

2120728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265097 (or 265093 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2120728 is about 1456.2719526242. The cubic root of 2120728 is about 128.4778686772.

The spelling of 2120728 in words is "two million, one hundred twenty thousand, seven hundred twenty-eight".