1224778520 has 192 divisors, whose sum is σ = 3390724800. Its totient is φ = 396211200.

The previous prime is 1224778517. The next prime is 1224778561. The reversal of 1224778520 is 258774221.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4552946 + ... + 4553214.

It is an arithmetic number, because the mean of its divisors is an integer number (17660025).

Almost surely, 2^1224778520 is an apocalyptic number.

1224778520 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 1224778520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1695362400).

1224778520 is an abundant number, since it is smaller than the sum of its proper divisors (2165946280).

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

1224778520 is a wasteful number, since it uses less digits than its factorization.

1224778520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 1224778520 is about 34996.8358569743. The cubic root of 1224778520 is about 1069.9229920996.

The spelling of 1224778520 in words is "one billion, two hundred twenty-four million, seven hundred seventy-eight thousand, five hundred twenty".