1281380764 has 12 divisors (see below), whose sum is σ = 2247024304. Its totient is φ = 639373824.

The previous prime is 1281380741. The next prime is 1281380773. The reversal of 1281380764 is 4670831821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326949 + ... + 330844.

Almost surely, 2^1281380764 is an apocalyptic number.

It is an amenable number.

1281380764 is a deficient number, since it is larger than the sum of its proper divisors (965643540).

1281380764 is a wasteful number, since it uses less digits than its factorization.

1281380764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658284 (or 658282 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1281380764 is about 35796.3792023719. The cubic root of 1281380764 is about 1086.1573198943.

The spelling of 1281380764 in words is "one billion, two hundred eighty-one million, three hundred eighty thousand, seven hundred sixty-four".