820763765 has 8 divisors (see below), whose sum is σ = 989334528. Its totient is φ = 653665680.

The previous prime is 820763761. The next prime is 820763803. The reversal of 820763765 is 567367028.

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

It is not a de Polignac number, because 820763765 - 2² = 820763761 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 (820763761) 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, 366941 + ... + 369170.

It is an arithmetic number, because the mean of its divisors is an integer number (123666816).

Almost surely, 2^820763765 is an apocalyptic number.

It is an amenable number.

820763765 is a deficient number, since it is larger than the sum of its proper divisors (168570763).

820763765 is a wasteful number, since it uses less digits than its factorization.

820763765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736339.

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 820763765 is about 28648.9749380323. The cubic root of 820763765 is about 936.2806723510.

The spelling of 820763765 in words is "eight hundred twenty million, seven hundred sixty-three thousand, seven hundred sixty-five".