1278005322 has 128 divisors (see below), whose sum is σ = 3042800640. Its totient is φ = 353687040.

The previous prime is 1278005317. The next prime is 1278005347. The reversal of 1278005322 is 2235008721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278005322.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7387228 + ... + 7387400.

It is an arithmetic number, because the mean of its divisors is an integer number (23771880).

Almost surely, 2^1278005322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278005322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1521400320).

1278005322 is an abundant number, since it is smaller than the sum of its proper divisors (1764795318).

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

1278005322 is a wasteful number, since it uses less digits than its factorization.

1278005322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1278005322 is about 35749.2002987479. The cubic root of 1278005322 is about 1085.2027545515.

The spelling of 1278005322 in words is "one billion, two hundred seventy-eight million, five thousand, three hundred twenty-two".