778696045 has 4 divisors (see below), whose sum is σ = 934435260. Its totient is φ = 622956832.

The previous prime is 778696013. The next prime is 778696063. The reversal of 778696045 is 540696877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540696877 = 7 ⋅77242411.

It can be written as a sum of positive squares in 2 ways, for example, as 574177444 + 204518601 = 23962^2 + 14301^2 .

It is a cyclic number.

It is not a de Polignac number, because 778696045 - 2⁵ = 778696013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778695983 and 778696001.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 77869600 + ... + 77869609.

It is an arithmetic number, because the mean of its divisors is an integer number (233608815).

Almost surely, 2^778696045 is an apocalyptic number.

It is an amenable number.

778696045 is a deficient number, since it is larger than the sum of its proper divisors (155739215).

778696045 is a wasteful number, since it uses less digits than its factorization.

778696045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155739214.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 778696045 is about 27905.1257836262. The cubic root of 778696045 is about 920.0031683098.

The spelling of 778696045 in words is "seven hundred seventy-eight million, six hundred ninety-six thousand, forty-five".