1223765280 has 192 divisors, whose sum is σ = 4336053120. Its totient is φ = 322311168.

The previous prime is 1223765267. The next prime is 1223765293. The reversal of 1223765280 is 825673221.

1223765280 is a `hidden beast` number, since 1 + 2 + 2 + 376 + 5 + 280 = 666.

It is an interprime number because it is at equal distance from previous prime (1223765267) and next prime (1223765293).

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

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, 356854 + ... + 360266.

It is an arithmetic number, because the mean of its divisors is an integer number (22583610).

Almost surely, 2^1223765280 is an apocalyptic number.

1223765280 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 1223765280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2168026560).

1223765280 is an abundant number, since it is smaller than the sum of its proper divisors (3112287840).

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

1223765280 is a wasteful number, since it uses less digits than its factorization.

1223765280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520 (or 3506 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1223765280 is about 34982.3566959117. The cubic root of 1223765280 is about 1069.6278672145.

The spelling of 1223765280 in words is "one billion, two hundred twenty-three million, seven hundred sixty-five thousand, two hundred eighty".