820743799 has 8 divisors (see below), whose sum is σ = 906806880. Its totient is φ = 738878976.

The previous prime is 820743787. The next prime is 820743809. The reversal of 820743799 is 997347028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820743799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820746799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049154 + ... + 1049935.

It is an arithmetic number, because the mean of its divisors is an integer number (113350860).

Almost surely, 2^820743799 is an apocalyptic number.

820743799 is a deficient number, since it is larger than the sum of its proper divisors (86063081).

820743799 is a wasteful number, since it uses less digits than its factorization.

820743799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099129.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 820743799 is about 28648.6264766742. The cubic root of 820743799 is about 936.2730802633.

The spelling of 820743799 in words is "eight hundred twenty million, seven hundred forty-three thousand, seven hundred ninety-nine".