1277820322428 has 96 divisors (see below), whose sum is σ = 3243107621376. Its totient is φ = 389240669952.

The previous prime is 1277820322417. The next prime is 1277820322451. The reversal of 1277820322428 is 8242230287721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25730950 + ... + 25780562.

It is an arithmetic number, because the mean of its divisors is an integer number (33782371056).

Almost surely, 2^{1277820322428} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277820322428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621553810688).

1277820322428 is an abundant number, since it is smaller than the sum of its proper divisors (1965287298948).

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

1277820322428 is a wasteful number, since it uses less digits than its factorization.

1277820322428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51283 (or 51281 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 48.

The spelling of 1277820322428 in words is "one trillion, two hundred seventy-seven billion, eight hundred twenty million, three hundred twenty-two thousand, four hundred twenty-eight".