1228752720 has 160 divisors (see below), whose sum is σ = 4558041600. Its totient is φ = 302455296.

The previous prime is 1228752691. The next prime is 1228752737. The reversal of 1228752720 is 272578221.

1228752720 is a `hidden beast` number, since 122 + 8 + 7 + 527 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6201 + ... + 49959.

It is an arithmetic number, because the mean of its divisors is an integer number (28487760).

Almost surely, 2^1228752720 is an apocalyptic number.

1228752720 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 1228752720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2279020800).

1228752720 is an abundant number, since it is smaller than the sum of its proper divisors (3329288880).

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

1228752720 is a wasteful number, since it uses less digits than its factorization.

1228752720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43794 (or 43782 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 1228752720 is about 35053.5692904446. The cubic root of 1228752720 is about 1071.0789826333.

The spelling of 1228752720 in words is "one billion, two hundred twenty-eight million, seven hundred fifty-two thousand, seven hundred twenty".