1281318264 has 40 divisors (see below), whose sum is σ = 3588879360. Its totient is φ = 427105872.

The previous prime is 1281318229. The next prime is 1281318307. The reversal of 1281318264 is 4628131821.

1281318264 is a `hidden beast` number, since 1 + 2 + 81 + 318 + 264 = 666.

It is a super-3 number, since 3×1281318264³ (a number of 28 digits) contains 333 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 988024 + ... + 989319.

It is an arithmetic number, because the mean of its divisors is an integer number (89721984).

Almost surely, 2^1281318264 is an apocalyptic number.

It is an amenable number.

1281318264 is an abundant number, since it is smaller than the sum of its proper divisors (2307561096).

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

1281318264 is a wasteful number, since it uses less digits than its factorization.

1281318264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977361 (or 1977348 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1281318264 is about 35795.5061984043. The cubic root of 1281318264 is about 1086.1396603148.

The spelling of 1281318264 in words is "one billion, two hundred eighty-one million, three hundred eighteen thousand, two hundred sixty-four".