1220628767 has 2 divisors, whose sum is σ = 1220628768. Its totient is φ = 1220628766.

The previous prime is 1220628709. The next prime is 1220628769. The reversal of 1220628767 is 7678260221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220628767 - 2²⁸ = 952193311 is a prime.

Together with 1220628769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220628769) 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 as a sum of consecutive naturals, namely, 610314383 + 610314384.

It is an arithmetic number, because the mean of its divisors is an integer number (610314384).

Almost surely, 2^1220628767 is an apocalyptic number.

1220628767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220628767 is an equidigital number, since it uses as much as digits as its factorization.

1220628767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 1220628767 is about 34937.4980071556. The cubic root of 1220628767 is about 1068.7132658988.

Adding to 1220628767 its reverse (7678260221), we get a palindrome (8898888988).

The spelling of 1220628767 in words is "one billion, two hundred twenty million, six hundred twenty-eight thousand, seven hundred sixty-seven".