785046721 has 4 divisors (see below), whose sum is σ = 804194244. Its totient is φ = 765899200.

The previous prime is 785046709. The next prime is 785046727. The reversal of 785046721 is 127640587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127640587 = 103 ⋅1239229.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 763748496 = 4615^2 + 27636^2 .

It is a cyclic number.

It is not a de Polignac number, because 785046721 - 2²⁵ = 751492289 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (785046727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9573700 + ... + 9573781.

It is an arithmetic number, because the mean of its divisors is an integer number (201048561).

Almost surely, 2^785046721 is an apocalyptic number.

It is an amenable number.

785046721 is a deficient number, since it is larger than the sum of its proper divisors (19147523).

785046721 is a wasteful number, since it uses less digits than its factorization.

785046721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19147522.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 785046721 is about 28018.6852118368. The cubic root of 785046721 is about 922.4974365080.

The spelling of 785046721 in words is "seven hundred eighty-five million, forty-six thousand, seven hundred twenty-one".