1277078980 has 24 divisors (see below), whose sum is σ = 2702988288. Its totient is φ = 506808288.

The previous prime is 1277078927. The next prime is 1277078987. The reversal of 1277078980 is 898707721.

It is not an unprimeable number, because it can be changed into a prime (1277078987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248854 + ... + 253933.

It is an arithmetic number, because the mean of its divisors is an integer number (112624512).

Almost surely, 2^1277078980 is an apocalyptic number.

1277078980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277078980 is an abundant number, since it is smaller than the sum of its proper divisors (1425909308).

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

1277078980 is a wasteful number, since it uses less digits than its factorization.

1277078980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502923 (or 502921 counting only the distinct ones).

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

The square root of 1277078980 is about 35736.2418281498. The cubic root of 1277078980 is about 1084.9404938094.

The spelling of 1277078980 in words is "one billion, two hundred seventy-seven million, seventy-eight thousand, nine hundred eighty".