1278493401048 has 128 divisors (see below), whose sum is σ = 3308677632000. Its totient is φ = 411366574080.

The previous prime is 1278493401047. The next prime is 1278493401089. The reversal of 1278493401048 is 8401043948721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278493401047) 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, 64271488 + ... + 64291376.

It is an arithmetic number, because the mean of its divisors is an integer number (25849044000).

Almost surely, 2^{1278493401048} 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 1278493401048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654338816000).

1278493401048 is an abundant number, since it is smaller than the sum of its proper divisors (2030184230952).

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

1278493401048 is a wasteful number, since it uses less digits than its factorization.

1278493401048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20505 (or 20501 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 1278493401048 in words is "one trillion, two hundred seventy-eight billion, four hundred ninety-three million, four hundred one thousand, forty-eight".