820751773 has 4 divisors (see below), whose sum is σ = 834662880. Its totient is φ = 806840668.

The previous prime is 820751761. The next prime is 820751783. The reversal of 820751773 is 377157028.

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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820751773 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820751713) 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, 6955465 + ... + 6955582.

It is an arithmetic number, because the mean of its divisors is an integer number (208665720).

Almost surely, 2^820751773 is an apocalyptic number.

It is an amenable number.

820751773 is a deficient number, since it is larger than the sum of its proper divisors (13911107).

820751773 is a wasteful number, since it uses less digits than its factorization.

820751773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13911106.

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 820751773 is about 28648.7656453118. The cubic root of 820751773 is about 936.2761123981.

The spelling of 820751773 in words is "eight hundred twenty million, seven hundred fifty-one thousand, seven hundred seventy-three".