1228782916 has 27 divisors (see below), whose sum is σ = 2286520957. Its totient is φ = 577689920.

The previous prime is 1228782901. The next prime is 1228782923. The reversal of 1228782916 is 6192878221.

The square root of 1228782916 is 35054.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 956664900 + 272118016 = 30930^2 + 16496^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1191321 + ... + 1192351.

Almost surely, 2^1228782916 is an apocalyptic number.

1228782916 is the 35054-th square number.

It is an amenable number.

1228782916 is a deficient number, since it is larger than the sum of its proper divisors (1057738041).

1228782916 is an equidigital number, since it uses as much as digits as its factorization.

1228782916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100 (or 1050 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The cubic root of 1228782916 is about 1071.0877563096.

The spelling of 1228782916 in words is "one billion, two hundred twenty-eight million, seven hundred eighty-two thousand, nine hundred sixteen".