1081312778 has 64 divisors (see below), whose sum is σ = 2129960448. Its totient is φ = 399513600.

The previous prime is 1081312741. The next prime is 1081312783. The reversal of 1081312778 is 8772131801.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422603 + ... + 425153.

It is an arithmetic number, because the mean of its divisors is an integer number (33280632).

Almost surely, 2^1081312778 is an apocalyptic number.

1081312778 is a deficient number, since it is larger than the sum of its proper divisors (1048647670).

1081312778 is a wasteful number, since it uses less digits than its factorization.

1081312778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 1081312778 is about 32883.3206656505. The cubic root of 1081312778 is about 1026.4011068699.

The spelling of 1081312778 in words is "one billion, eighty-one million, three hundred twelve thousand, seven hundred seventy-eight".