1278622828242 has 64 divisors (see below), whose sum is σ = 2859816960000. Its totient is φ = 423451625040.

The previous prime is 1278622828229. The next prime is 1278622828247. The reversal of 1278622828242 is 2428282268721.

1278622828242 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 622 + 8 + 2 + 8 + 2 + 4 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1278622828247) 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, 5031759 + ... + 5279757.

It is an arithmetic number, because the mean of its divisors is an integer number (44684640000).

Almost surely, 2^{1278622828242} is an apocalyptic number.

1278622828242 is an abundant number, since it is smaller than the sum of its proper divisors (1581194131758).

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

1278622828242 is a wasteful number, since it uses less digits than its factorization.

1278622828242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248628 (or 248622 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 54.

The spelling of 1278622828242 in words is "one trillion, two hundred seventy-eight billion, six hundred twenty-two million, eight hundred twenty-eight thousand, two hundred forty-two".