1277790880 has 48 divisors (see below), whose sum is σ = 3083028480. Its totient is φ = 500238592.

The previous prime is 1277790853. The next prime is 1277790901. The reversal of 1277790880 is 880977721.

It is a super-2 number, since 2×1277790880² = 3265499066022348800, which contains 22 as substring.

It is an unprimeable number.

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, 77440 + ... + 92479.

It is an arithmetic number, because the mean of its divisors is an integer number (64229760).

Almost surely, 2^1277790880 is an apocalyptic number.

1277790880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277790880 is an abundant number, since it is smaller than the sum of its proper divisors (1805237600).

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

1277790880 is a wasteful number, since it uses less digits than its factorization.

1277790880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169981 (or 169973 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 49.

The square root of 1277790880 is about 35746.2009170205. The cubic root of 1277790880 is about 1085.1420542131.

The spelling of 1277790880 in words is "one billion, two hundred seventy-seven million, seven hundred ninety thousand, eight hundred eighty".