1228628573 has 4 divisors (see below), whose sum is σ = 1300900860. Its totient is φ = 1156356288.

The previous prime is 1228628537. The next prime is 1228628579. The reversal of 1228628573 is 3758268221.

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 546530884 + 682097689 = 23378^2 + 26117^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228628573 - 2¹⁰ = 1228627549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228628579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36136118 + ... + 36136151.

It is an arithmetic number, because the mean of its divisors is an integer number (325225215).

Almost surely, 2^1228628573 is an apocalyptic number.

It is an amenable number.

1228628573 is a deficient number, since it is larger than the sum of its proper divisors (72272287).

1228628573 is an equidigital number, since it uses as much as digits as its factorization.

1228628573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72272286.

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

The square root of 1228628573 is about 35051.7984274702. The cubic root of 1228628573 is about 1071.0429092724.

The spelling of 1228628573 in words is "one billion, two hundred twenty-eight million, six hundred twenty-eight thousand, five hundred seventy-three".