1220776263 has 24 divisors (see below), whose sum is σ = 2024151168. Its totient is φ = 694505232.

The previous prime is 1220776253. The next prime is 1220776279. The reversal of 1220776263 is 3626770221.

It is a happy number.

1220776263 is a `hidden beast` number, since 1 + 2 + 20 + 7 + 7 + 626 + 3 = 666.

It is not a de Polignac number, because 1220776263 - 2⁵ = 1220776231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220776213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28381 + ... + 56982.

It is an arithmetic number, because the mean of its divisors is an integer number (84339632).

Almost surely, 2^1220776263 is an apocalyptic number.

1220776263 is a deficient number, since it is larger than the sum of its proper divisors (803374905).

1220776263 is a wasteful number, since it uses less digits than its factorization.

1220776263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85603 (or 85600 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 1220776263 is about 34939.6087986114. The cubic root of 1220776263 is about 1068.7563105404.

The spelling of 1220776263 in words is "one billion, two hundred twenty million, seven hundred seventy-six thousand, two hundred sixty-three".