786643361 has 4 divisors (see below), whose sum is σ = 899020992. Its totient is φ = 674265732.

The previous prime is 786643337. The next prime is 786643387. The reversal of 786643361 is 163346687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-786643361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (786643391) 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, 56188805 + ... + 56188818.

It is an arithmetic number, because the mean of its divisors is an integer number (224755248).

Almost surely, 2^786643361 is an apocalyptic number.

It is an amenable number.

786643361 is a deficient number, since it is larger than the sum of its proper divisors (112377631).

786643361 is a wasteful number, since it uses less digits than its factorization.

786643361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112377630.

The product of its digits is 435456, while the sum is 44.

The square root of 786643361 is about 28047.1631542301. The cubic root of 786643361 is about 923.1224094603.

The spelling of 786643361 in words is "seven hundred eighty-six million, six hundred forty-three thousand, three hundred sixty-one".