1078778017 has 4 divisors (see below), whose sum is σ = 1078843716. Its totient is φ = 1078712320.

The previous prime is 1078777951. The next prime is 1078778033. The reversal of 1078778017 is 7108778701.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 596141056 + 482636961 = 24416^2 + 21969^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078778017 - 2²³ = 1070389409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1078728017) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15633 + ... + 49009.

It is an arithmetic number, because the mean of its divisors is an integer number (269710929).

Almost surely, 2^1078778017 is an apocalyptic number.

It is an amenable number.

1078778017 is a deficient number, since it is larger than the sum of its proper divisors (65699).

1078778017 is an equidigital number, since it uses as much as digits as its factorization.

1078778017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65698.

The product of its (nonzero) digits is 153664, while the sum is 46.

The square root of 1078778017 is about 32844.7563090366. The cubic root of 1078778017 is about 1025.5984661316.

It can be divided in two parts, 10787 and 78017, that added together give a square (88804 = 298²).

The spelling of 1078778017 in words is "one billion, seventy-eight million, seven hundred seventy-eight thousand, seventeen".