1278561042 has 96 divisors (see below), whose sum is σ = 3097875456. Its totient is φ = 377848800.

The previous prime is 1278561023. The next prime is 1278561071. The reversal of 1278561042 is 2401658721.

It is a junction number, because it is equal to n+sod(n) for n = 1278560988 and 1278561006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1447533 + ... + 1448415.

It is an arithmetic number, because the mean of its divisors is an integer number (32269536).

Almost surely, 2^1278561042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278561042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1548937728).

1278561042 is an abundant number, since it is smaller than the sum of its proper divisors (1819314414).

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

1278561042 is a wasteful number, since it uses less digits than its factorization.

1278561042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1278561042 is about 35756.9719355541. The cubic root of 1278561042 is about 1085.3600260625.

The spelling of 1278561042 in words is "one billion, two hundred seventy-eight million, five hundred sixty-one thousand, forty-two".