1277267428320 has 768 divisors, whose sum is σ = 4561131617280. Its totient is φ = 298412015616.

The previous prime is 1277267428289. The next prime is 1277267428331. The reversal of 1277267428320 is 238247627721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1307335672 + ... + 1307336648.

It is an arithmetic number, because the mean of its divisors is an integer number (5938973460).

Almost surely, 2^{1277267428320} is an apocalyptic number.

1277267428320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277267428320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280565808640).

1277267428320 is an abundant number, since it is smaller than the sum of its proper divisors (3283864188960).

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

1277267428320 is a wasteful number, since it uses less digits than its factorization.

1277267428320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 51.

The spelling of 1277267428320 in words is "one trillion, two hundred seventy-seven billion, two hundred sixty-seven million, four hundred twenty-eight thousand, three hundred twenty".