1277879977 has 32 divisors (see below), whose sum is σ = 1504521216. Its totient is φ = 1073688000.

The previous prime is 1277879971. The next prime is 1277880059. The reversal of 1277879977 is 7799787721.

It is not a de Polignac number, because 1277879977 - 2⁷ = 1277879849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1277879971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1098198 + ... + 1099360.

It is an arithmetic number, because the mean of its divisors is an integer number (47016288).

Almost surely, 2^1277879977 is an apocalyptic number.

It is an amenable number.

1277879977 is a deficient number, since it is larger than the sum of its proper divisors (226641239).

1277879977 is a wasteful number, since it uses less digits than its factorization.

1277879977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its digits is 21781872, while the sum is 64.

The square root of 1277879977 is about 35747.4471396210. The cubic root of 1277879977 is about 1085.1672749948.

The spelling of 1277879977 in words is "one billion, two hundred seventy-seven million, eight hundred seventy-nine thousand, nine hundred seventy-seven".