1220808766 has 32 divisors (see below), whose sum is σ = 2010355200. Its totient is φ = 554141280.

The previous prime is 1220808761. The next prime is 1220808791. The reversal of 1220808766 is 6678080221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220808761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70951 + ... + 86461.

It is an arithmetic number, because the mean of its divisors is an integer number (62823600).

Almost surely, 2^1220808766 is an apocalyptic number.

1220808766 is a deficient number, since it is larger than the sum of its proper divisors (789546434).

1220808766 is a wasteful number, since it uses less digits than its factorization.

1220808766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15624.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1220808766 is about 34940.0739266533. The cubic root of 1220808766 is about 1068.7657956194.

Adding to 1220808766 its reverse (6678080221), we get a palindrome (7898888987).

The spelling of 1220808766 in words is "one billion, two hundred twenty million, eight hundred eight thousand, seven hundred sixty-six".