1228507280 has 480 divisors, whose sum is σ = 4147234560. Its totient is φ = 326430720.

The previous prime is 1228507279. The next prime is 1228507289. The reversal of 1228507280 is 827058221.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1228507280.

It is not an unprimeable number, because it can be changed into a prime (1228507289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 42362306 + ... + 42362334.

It is an arithmetic number, because the mean of its divisors is an integer number (8640072).

Almost surely, 2^1228507280 is an apocalyptic number.

1228507280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228507280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073617280).

1228507280 is an abundant number, since it is smaller than the sum of its proper divisors (2918727280).

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

1228507280 is a wasteful number, since it uses less digits than its factorization.

1228507280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 1228507280 is about 35050.0681882361. The cubic root of 1228507280 is about 1071.0076628506.

The spelling of 1228507280 in words is "one billion, two hundred twenty-eight million, five hundred seven thousand, two hundred eighty".