1277711648 has 12 divisors (see below), whose sum is σ = 2515494870. Its totient is φ = 638855808.

The previous prime is 1277711647. The next prime is 1277711681. The reversal of 1277711648 is 8461177721.

It can be written as a sum of positive squares in only one way, i.e., 1275061264 + 2650384 = 35708^2 + 1628^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1277711599 and 1277711608.

It is not an unprimeable number, because it can be changed into a prime (1277711647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19964213 + ... + 19964276.

Almost surely, 2^1277711648 is an apocalyptic number.

It is an amenable number.

1277711648 is a deficient number, since it is larger than the sum of its proper divisors (1237783222).

1277711648 is an equidigital number, since it uses as much as digits as its factorization.

1277711648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39928499 (or 39928491 counting only the distinct ones).

The product of its digits is 131712, while the sum is 44.

The square root of 1277711648 is about 35745.0926422075. The cubic root of 1277711648 is about 1085.1196249425.

The spelling of 1277711648 in words is "one billion, two hundred seventy-seven million, seven hundred eleven thousand, six hundred forty-eight".