1281136764 has 24 divisors (see below), whose sum is σ = 2990447488. Its totient is φ = 426884400.

The previous prime is 1281136687. The next prime is 1281136781. The reversal of 1281136764 is 4676311821.

It is a super-2 number, since 2×1281136764² = 3282622816144783392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15489 + ... + 52935.

Almost surely, 2^1281136764 is an apocalyptic number.

It is an amenable number.

1281136764 is an abundant number, since it is smaller than the sum of its proper divisors (1709310724).

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

1281136764 is a wasteful number, since it uses less digits than its factorization.

1281136764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40305 (or 40303 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 1281136764 is about 35792.9708741814. The cubic root of 1281136764 is about 1086.0883736406.

The spelling of 1281136764 in words is "one billion, two hundred eighty-one million, one hundred thirty-six thousand, seven hundred sixty-four".