1278591006 has 96 divisors (see below), whose sum is σ = 3300600960. Its totient is φ = 326424000.

The previous prime is 1278590983. The next prime is 1278591007. The reversal of 1278591006 is 6001958721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278591007) by changing a digit.

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, 187456 + ... + 194156.

It is an arithmetic number, because the mean of its divisors is an integer number (34381260).

Almost surely, 2^1278591006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278591006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650300480).

1278591006 is an abundant number, since it is smaller than the sum of its proper divisors (2022009954).

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

1278591006 is a wasteful number, since it uses less digits than its factorization.

1278591006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790 (or 6783 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 1278591006 is about 35757.3909283102. The cubic root of 1278591006 is about 1085.3685047279.

The spelling of 1278591006 in words is "one billion, two hundred seventy-eight million, five hundred ninety-one thousand, six".