1277725216 has 24 divisors (see below), whose sum is σ = 2516390604. Its totient is φ = 638641920.

The previous prime is 1277725133. The next prime is 1277725231. The reversal of 1277725216 is 6125277721.

It can be written as a sum of positive squares in 2 ways, for example, as 1193011600 + 84713616 = 34540^2 + 9204^2 .

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, 127426 + ... + 137086.

Almost surely, 2^1277725216 is an apocalyptic number.

1277725216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1277725216 is a deficient number, since it is larger than the sum of its proper divisors (1238665388).

1277725216 is an equidigital number, since it uses as much as digits as its factorization.

1277725216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13804 (or 13796 counting only the distinct ones).

The product of its digits is 82320, while the sum is 40.

The square root of 1277725216 is about 35745.2824299935. The cubic root of 1277725216 is about 1085.1234658850.

The spelling of 1277725216 in words is "one billion, two hundred seventy-seven million, seven hundred twenty-five thousand, two hundred sixteen".