1228949280 has 384 divisors, whose sum is σ = 4707763200. Its totient is φ = 297603072.

The previous prime is 1228949251. The next prime is 1228949303. The reversal of 1228949280 is 829498221.

It is a happy number.

1228949280 is a `hidden beast` number, since 1 + 2 + 2 + 89 + 492 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4436502 + ... + 4436778.

It is an arithmetic number, because the mean of its divisors is an integer number (12259800).

Almost surely, 2^1228949280 is an apocalyptic number.

1228949280 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 1228949280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2353881600).

1228949280 is an abundant number, since it is smaller than the sum of its proper divisors (3478813920).

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

1228949280 is a wasteful number, since it uses less digits than its factorization.

1228949280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1228949280 is about 35056.3728871086. The cubic root of 1228949280 is about 1071.1360920517.

The spelling of 1228949280 in words is "one billion, two hundred twenty-eight million, nine hundred forty-nine thousand, two hundred eighty".