1228878720 has 192 divisors, whose sum is σ = 4269507840. Its totient is φ = 325693440.

The previous prime is 1228878697. The next prime is 1228878737. The reversal of 1228878720 is 278788221.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1099602 + ... + 1100718.

It is an arithmetic number, because the mean of its divisors is an integer number (22237020).

Almost surely, 2^1228878720 is an apocalyptic number.

1228878720 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 1228878720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2134753920).

1228878720 is an abundant number, since it is smaller than the sum of its proper divisors (3040629120).

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

1228878720 is a wasteful number, since it uses less digits than its factorization.

1228878720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 1228878720 is about 35055.3664935912. The cubic root of 1228878720 is about 1071.1155919355.

The spelling of 1228878720 in words is "one billion, two hundred twenty-eight million, eight hundred seventy-eight thousand, seven hundred twenty".