1244738880 has 448 divisors, whose sum is σ = 5477621760. Its totient is φ = 258508800.

The previous prime is 1244738821. The next prime is 1244738917. The reversal of 1244738880 is 888374421.

1244738880 is a `hidden beast` number, since 1 + 24 + 473 + 88 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

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

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 664345 + ... + 666215.

Almost surely, 2^1244738880 is an apocalyptic number.

1244738880 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 1244738880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738810880).

1244738880 is an abundant number, since it is smaller than the sum of its proper divisors (4232882880).

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

1244738880 is a wasteful number, since it uses less digits than its factorization.

1244738880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 1244738880 is about 35280.8571324451. The cubic root of 1244738880 is about 1075.7039211531.

The spelling of 1244738880 in words is "one billion, two hundred forty-four million, seven hundred thirty-eight thousand, eight hundred eighty".