1228782776 has 24 divisors (see below), whose sum is σ = 2494831680. Its totient is φ = 567129888.

The previous prime is 1228782773. The next prime is 1228782781. The reversal of 1228782776 is 6772878221.

It is a super-2 number, since 2×1228782776² = 3019814221188532352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228782773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 453080 + ... + 455783.

It is an arithmetic number, because the mean of its divisors is an integer number (103951320).

Almost surely, 2^1228782776 is an apocalyptic number.

It is an amenable number.

1228782776 is an abundant number, since it is smaller than the sum of its proper divisors (1266048904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1228782776 is a wasteful number, since it uses less digits than its factorization.

1228782776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908895 (or 908878 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 50.

The square root of 1228782776 is about 35053.9980030809. The cubic root of 1228782776 is about 1071.0877156319.

The spelling of 1228782776 in words is "one billion, two hundred twenty-eight million, seven hundred eighty-two thousand, seven hundred seventy-six".