1277988764 has 24 divisors (see below), whose sum is σ = 2486214528. Its totient is φ = 570813120.

The previous prime is 1277988757. The next prime is 1277988779. The reversal of 1277988764 is 4678897721.

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, 394787 + ... + 398010.

It is an arithmetic number, because the mean of its divisors is an integer number (103592272).

Almost surely, 2^1277988764 is an apocalyptic number.

It is an amenable number.

1277988764 is a deficient number, since it is larger than the sum of its proper divisors (1208225764).

1277988764 is a wasteful number, since it uses less digits than its factorization.

1277988764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792845 (or 792843 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 59.

The square root of 1277988764 is about 35748.9687123978. The cubic root of 1277988764 is about 1085.1980678561.

The spelling of 1277988764 in words is "one billion, two hundred seventy-seven million, nine hundred eighty-eight thousand, seven hundred sixty-four".