785728646 has 4 divisors (see below), whose sum is σ = 1178592972. Its totient is φ = 392864322.

The previous prime is 785728613. The next prime is 785728667. The reversal of 785728646 is 646827587.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196432160 + ... + 196432163.

It is an arithmetic number, because the mean of its divisors is an integer number (294648243).

Almost surely, 2^785728646 is an apocalyptic number.

785728646 is a deficient number, since it is larger than the sum of its proper divisors (392864326).

785728646 is a wasteful number, since it uses less digits than its factorization.

785728646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392864325.

The product of its digits is 4515840, while the sum is 53.

The square root of 785728646 is about 28030.8516816739. The cubic root of 785728646 is about 922.7644660527.

The spelling of 785728646 in words is "seven hundred eighty-five million, seven hundred twenty-eight thousand, six hundred forty-six".