1228763285 has 4 divisors (see below), whose sum is σ = 1474515948. Its totient is φ = 983010624.

The previous prime is 1228763251. The next prime is 1228763309. The reversal of 1228763285 is 5823678221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138839089 + 1089924196 = 11783^2 + 33014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228763285 - 2¹⁴ = 1228746901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122876324 + ... + 122876333.

It is an arithmetic number, because the mean of its divisors is an integer number (368628987).

Almost surely, 2^1228763285 is an apocalyptic number.

It is an amenable number.

1228763285 is a deficient number, since it is larger than the sum of its proper divisors (245752663).

1228763285 is an equidigital number, since it uses as much as digits as its factorization.

1228763285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245752662.

The product of its digits is 322560, while the sum is 44.

The square root of 1228763285 is about 35053.7199880412. The cubic root of 1228763285 is about 1071.0820523903.

The spelling of 1228763285 in words is "one billion, two hundred twenty-eight million, seven hundred sixty-three thousand, two hundred eighty-five".