1277256880 has 40 divisors (see below), whose sum is σ = 2973358800. Its totient is φ = 510259968.

The previous prime is 1277256859. The next prime is 1277256881. The reversal of 1277256880 is 886527721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1277256880.

It is not an unprimeable number, because it can be changed into a prime (1277256881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56691 + ... + 75949.

It is an arithmetic number, because the mean of its divisors is an integer number (74333970).

Almost surely, 2^1277256880 is an apocalyptic number.

1277256880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277256880 is an abundant number, since it is smaller than the sum of its proper divisors (1696101920).

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

1277256880 is a wasteful number, since it uses less digits than its factorization.

1277256880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101 (or 20095 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 1277256880 is about 35738.7308112641. The cubic root of 1277256880 is about 1084.9908696946.

The spelling of 1277256880 in words is "one billion, two hundred seventy-seven million, two hundred fifty-six thousand, eight hundred eighty".