405120728 has 16 divisors (see below), whose sum is σ = 759880680. Its totient is φ = 202485888.

The previous prime is 405120697. The next prime is 405120731. The reversal of 405120728 is 827021504.

It is a self number, because there is not a number n which added to its sum of digits gives 405120728.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18800 + ... + 34112.

Almost surely, 2^405120728 is an apocalyptic number.

It is an amenable number.

405120728 is a deficient number, since it is larger than the sum of its proper divisors (354759952).

405120728 is a wasteful number, since it uses less digits than its factorization.

405120728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18626 (or 18622 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 405120728 is about 20127.6110852729. The cubic root of 405120728 is about 739.9371312550.

The spelling of 405120728 in words is "four hundred five million, one hundred twenty thousand, seven hundred twenty-eight".