1244764920 has 256 divisors, whose sum is σ = 4470681600. Its totient is φ = 271319040.

The previous prime is 1244764909. The next prime is 1244764921. The reversal of 1244764920 is 294674421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244764921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1618296 + ... + 1619064.

It is an arithmetic number, because the mean of its divisors is an integer number (17463600).

Almost surely, 2^1244764920 is an apocalyptic number.

1244764920 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 1244764920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2235340800).

1244764920 is an abundant number, since it is smaller than the sum of its proper divisors (3225916680).

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

1244764920 is a wasteful number, since it uses less digits than its factorization.

1244764920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 1244764920 is about 35281.2261691682. The cubic root of 1244764920 is about 1075.7114223608.

The spelling of 1244764920 in words is "one billion, two hundred forty-four million, seven hundred sixty-four thousand, nine hundred twenty".