1263870720 has 324 divisors, whose sum is σ = 5089069440. Its totient is φ = 288755712.

The previous prime is 1263870697. The next prime is 1263870733. The reversal of 1263870720 is 270783621.

1263870720 is a `hidden beast` number, since 12 + 638 + 7 + 0 + 7 + 2 + 0 = 666.

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

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 35 ways as a sum of consecutive naturals, for example, 563361 + ... + 565599.

Almost surely, 2^1263870720 is an apocalyptic number.

1263870720 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 1263870720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2544534720).

1263870720 is an abundant number, since it is smaller than the sum of its proper divisors (3825198720).

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

1263870720 is a wasteful number, since it uses less digits than its factorization.

1263870720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1263870720 is about 35550.9594807229. The cubic root of 1263870720 is about 1081.1871719093.

The spelling of 1263870720 in words is "one billion, two hundred sixty-three million, eight hundred seventy thousand, seven hundred twenty".