1278062773652 has 108 divisors (see below), whose sum is σ = 2823657782652. Its totient is φ = 502945228800.

The previous prime is 1278062773619. The next prime is 1278062773657. The reversal of 1278062773652 is 2563772608721.

It can be written as a sum of positive squares in 6 ways, for example, as 75364524676 + 1202698248976 = 274526^2 + 1096676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278062773657) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5487002 + ... + 5715182.

It is an arithmetic number, because the mean of its divisors is an integer number (26144979469).

Almost surely, 2^{1278062773652} 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 1278062773652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411828891326).

1278062773652 is an abundant number, since it is smaller than the sum of its proper divisors (1545595009000).

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

1278062773652 is a wasteful number, since it uses less digits than its factorization.

1278062773652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228298 (or 228248 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 56.

The spelling of 1278062773652 in words is "one trillion, two hundred seventy-eight billion, sixty-two million, seven hundred seventy-three thousand, six hundred fifty-two".