1228855645 has 8 divisors (see below), whose sum is σ = 1488156120. Its totient is φ = 974064960.

The previous prime is 1228855631. The next prime is 1228855669. The reversal of 1228855645 is 5465588221.

It can be written as a sum of positive squares in 4 ways, for example, as 388957284 + 839898361 = 19722^2 + 28981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1228855645 - 2¹¹ = 1228853597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228855595 and 1228855604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126846 + ... + 1127935.

It is an arithmetic number, because the mean of its divisors is an integer number (186019515).

Almost surely, 2^1228855645 is an apocalyptic number.

It is an amenable number.

1228855645 is a deficient number, since it is larger than the sum of its proper divisors (259300475).

1228855645 is a wasteful number, since it uses less digits than its factorization.

1228855645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254895.

The product of its digits is 768000, while the sum is 46.

The square root of 1228855645 is about 35055.0373698275. The cubic root of 1228855645 is about 1071.1088876811.

The spelling of 1228855645 in words is "one billion, two hundred twenty-eight million, eight hundred fifty-five thousand, six hundred forty-five".