1223764520 has 128 divisors (see below), whose sum is σ = 3120353280. Its totient is φ = 428064000.

The previous prime is 1223764469. The next prime is 1223764537. The reversal of 1223764520 is 254673221.

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, 1342865 + ... + 1343775.

It is an arithmetic number, because the mean of its divisors is an integer number (24377760).

Almost surely, 2^1223764520 is an apocalyptic number.

1223764520 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 1223764520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560176640).

1223764520 is an abundant number, since it is smaller than the sum of its proper divisors (1896588760).

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

1223764520 is a wasteful number, since it uses less digits than its factorization.

1223764520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 1223764520 is about 34982.3458332914. The cubic root of 1223764520 is about 1069.6276457893.

The spelling of 1223764520 in words is "one billion, two hundred twenty-three million, seven hundred sixty-four thousand, five hundred twenty".