820653766 has 4 divisors (see below), whose sum is σ = 1230980652. Its totient is φ = 410326882.

The previous prime is 820653763. The next prime is 820653797. The reversal of 820653766 is 667356028.

820653766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820653763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205163440 + ... + 205163443.

It is an arithmetic number, because the mean of its divisors is an integer number (307745163).

Almost surely, 2^820653766 is an apocalyptic number.

820653766 is a deficient number, since it is larger than the sum of its proper divisors (410326886).

820653766 is a wasteful number, since it uses less digits than its factorization.

820653766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410326885.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 820653766 is about 28647.0551017029. The cubic root of 820653766 is about 936.2388436124.

The spelling of 820653766 in words is "eight hundred twenty million, six hundred fifty-three thousand, seven hundred sixty-six".