1277042273920 has 256 divisors, whose sum is σ = 3821697158400. Its totient is φ = 397876985856.

The previous prime is 1277042273909. The next prime is 1277042273929. The reversal of 1277042273920 is 293722407721.

It is not an unprimeable number, because it can be changed into a prime (1277042273929) 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, 1919539 + ... + 2497741.

It is an arithmetic number, because the mean of its divisors is an integer number (14928504525).

Almost surely, 2^{1277042273920} is an apocalyptic number.

1277042273920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277042273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1910848579200).

1277042273920 is an abundant number, since it is smaller than the sum of its proper divisors (2544654884480).

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

1277042273920 is a wasteful number, since it uses less digits than its factorization.

1277042273920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578275 (or 578263 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 46.

The spelling of 1277042273920 in words is "one trillion, two hundred seventy-seven billion, forty-two million, two hundred seventy-three thousand, nine hundred twenty".