1263401280 has 448 divisors, whose sum is σ = 4740249600. Its totient is φ = 316293120.

The previous prime is 1263401231. The next prime is 1263401303. The reversal of 1263401280 is 821043621.

1263401280 is a `hidden beast` number, since 1 + 2 + 634 + 0 + 1 + 28 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14195476 + ... + 14195564.

Almost surely, 2^1263401280 is an apocalyptic number.

1263401280 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 1263401280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2370124800).

1263401280 is an abundant number, since it is smaller than the sum of its proper divisors (3476848320).

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

1263401280 is a wasteful number, since it uses less digits than its factorization.

1263401280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1263401280 is about 35544.3565140797. The cubic root of 1263401280 is about 1081.0532934065.

The spelling of 1263401280 in words is "one billion, two hundred sixty-three million, four hundred one thousand, two hundred eighty".