820136764 has 12 divisors (see below), whose sum is σ = 1468617304. Its totient is φ = 400531824.

The previous prime is 820136747. The next prime is 820136777. The reversal of 820136764 is 467631028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383947 + ... + 2384290.

Almost surely, 2^820136764 is an apocalyptic number.

It is an amenable number.

820136764 is a deficient number, since it is larger than the sum of its proper divisors (648480540).

820136764 is a wasteful number, since it uses less digits than its factorization.

820136764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4768284 (or 4768282 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 820136764 is about 28638.0300300143. The cubic root of 820136764 is about 936.0421959086.

The spelling of 820136764 in words is "eight hundred twenty million, one hundred thirty-six thousand, seven hundred sixty-four".