1263863868 has 96 divisors (see below), whose sum is σ = 3088834560. Its totient is φ = 401909760.

The previous prime is 1263863863. The next prime is 1263863891. The reversal of 1263863868 is 8683683621.

It is a self number, because there is not a number n which added to its sum of digits gives 1263863868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263863863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7060603 + ... + 7060781.

It is an arithmetic number, because the mean of its divisors is an integer number (32175360).

Almost surely, 2^1263863868 is an apocalyptic number.

It is an amenable number.

1263863868 is an abundant number, since it is smaller than the sum of its proper divisors (1824970692).

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

1263863868 is a wasteful number, since it uses less digits than its factorization.

1263863868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 465 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The square root of 1263863868 is about 35550.8631118852. The cubic root of 1263863868 is about 1081.1852180417.

The spelling of 1263863868 in words is "one billion, two hundred sixty-three million, eight hundred sixty-three thousand, eight hundred sixty-eight".