1599796778 has 4 divisors (see below), whose sum is σ = 2399695170. Its totient is φ = 799898388.

The previous prime is 1599796777. The next prime is 1599796823. The reversal of 1599796778 is 8776979951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 933485809 + 666310969 = 30553^2 + 25813^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1599796777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 399949193 + ... + 399949196.

Almost surely, 2^1599796778 is an apocalyptic number.

1599796778 is a deficient number, since it is larger than the sum of its proper divisors (799898392).

1599796778 is an equidigital number, since it uses as much as digits as its factorization.

1599796778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799898391.

The product of its digits is 60011280, while the sum is 68.

The square root of 1599796778 is about 39997.4596443324. The cubic root of 1599796778 is about 1169.5575744607.

The spelling of 1599796778 in words is "one billion, five hundred ninety-nine million, seven hundred ninety-six thousand, seven hundred seventy-eight".