785728643 has 16 divisors (see below), whose sum is σ = 904909824. Its totient is φ = 668304000.

The previous prime is 785728613. The next prime is 785728667. The reversal of 785728643 is 346827587.

It is not a de Polignac number, because 785728643 - 2¹⁶ = 785663107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 785728591 and 785728600.

It is not an unprimeable number, because it can be changed into a prime (785728613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 591446 + ... + 592772.

It is an arithmetic number, because the mean of its divisors is an integer number (56556864).

Almost surely, 2^785728643 is an apocalyptic number.

785728643 is a deficient number, since it is larger than the sum of its proper divisors (119181181).

785728643 is a wasteful number, since it uses less digits than its factorization.

785728643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922.

The product of its digits is 2257920, while the sum is 50.

The square root of 785728643 is about 28030.8516281614. The cubic root of 785728643 is about 922.7644648783.

The spelling of 785728643 in words is "seven hundred eighty-five million, seven hundred twenty-eight thousand, six hundred forty-three".