1277767328 has 96 divisors (see below), whose sum is σ = 2823387840. Its totient is φ = 565678080.

The previous prime is 1277767327. The next prime is 1277767363. The reversal of 1277767328 is 8237677721.

It is not an unprimeable number, because it can be changed into a prime (1277767327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1870475 + ... + 1871157.

It is an arithmetic number, because the mean of its divisors is an integer number (29410290).

Almost surely, 2^1277767328 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 1277767328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411693920).

1277767328 is an abundant number, since it is smaller than the sum of its proper divisors (1545620512).

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

1277767328 is a wasteful number, since it uses less digits than its factorization.

1277767328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 902 counting only the distinct ones).

The product of its digits is 1382976, while the sum is 50.

The square root of 1277767328 is about 35745.8714818928. The cubic root of 1277767328 is about 1085.1353871278.

The spelling of 1277767328 in words is "one billion, two hundred seventy-seven million, seven hundred sixty-seven thousand, three hundred twenty-eight".