1277638319220 has 48 divisors (see below), whose sum is σ = 3732925875840. Its totient is φ = 325890353536.

The previous prime is 1277638319213. The next prime is 1277638319227. The reversal of 1277638319220 is 229138367721.

It is an interprime number because it is at equal distance from previous prime (1277638319213) and next prime (1277638319227).

It is a super-3 number, since 3×1277638319220³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277638319227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462911055 + ... + 462913814.

It is an arithmetic number, because the mean of its divisors is an integer number (77769289080).

Almost surely, 2^{1277638319220} is an apocalyptic number.

1277638319220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277638319220 is an abundant number, since it is smaller than the sum of its proper divisors (2455287556620).

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

1277638319220 is a wasteful number, since it uses less digits than its factorization.

1277638319220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925824904 (or 925824902 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 1277638319220 in words is "one trillion, two hundred seventy-seven billion, six hundred thirty-eight million, three hundred nineteen thousand, two hundred twenty".