1277338128 has 80 divisors (see below), whose sum is σ = 3643266816. Its totient is φ = 382395520.

The previous prime is 1277338103. The next prime is 1277338151. The reversal of 1277338128 is 8218337721.

It is a self number, because there is not a number n which added to its sum of digits gives 1277338128.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29251 + ... + 58397.

Almost surely, 2^1277338128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277338128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1821633408).

1277338128 is an abundant number, since it is smaller than the sum of its proper divisors (2365928688).

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

1277338128 is a wasteful number, since it uses less digits than its factorization.

1277338128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29252 (or 29246 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 1277338128 is about 35739.8674871634. The cubic root of 1277338128 is about 1085.0138751084.

The spelling of 1277338128 in words is "one billion, two hundred seventy-seven million, three hundred thirty-eight thousand, one hundred twenty-eight".