778256039 has 16 divisors (see below), whose sum is σ = 923252256. Its totient is φ = 647884800.

The previous prime is 778256029. The next prime is 778256053. The reversal of 778256039 is 930652877.

It is a de Polignac number, because none of the positive numbers 2^k-778256039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 778255984 and 778256002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778256029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49322 + ... + 63159.

It is an arithmetic number, because the mean of its divisors is an integer number (57703266).

Almost surely, 2^778256039 is an apocalyptic number.

778256039 is a deficient number, since it is larger than the sum of its proper divisors (144996217).

778256039 is a wasteful number, since it uses less digits than its factorization.

778256039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112546.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 778256039 is about 27897.2407058476. The cubic root of 778256039 is about 919.8298515680.

The spelling of 778256039 in words is "seven hundred seventy-eight million, two hundred fifty-six thousand, thirty-nine".