778920 has 32 divisors (see below), whose sum is σ = 2337120. Its totient is φ = 207680.

The previous prime is 778913. The next prime is 778927. The reversal of 778920 is 29877.

778920 = T₃₀₄ + T₃₀₅ + ... + T₃₁₉.

778920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (778913) and next prime (778927).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3126 + ... + 3365.

It is an arithmetic number, because the mean of its divisors is an integer number (73035).

2⁷⁷⁸⁹²⁰ is an apocalyptic number.

It is an amenable number.

778920 is an abundant number, since it is smaller than the sum of its proper divisors (1558200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778920 is a wasteful number, since it uses less digits than its factorization.

778920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6505 (or 6501 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 778920 is about 882.5644452390. The cubic root of 778920 is about 92.0091358287.

The spelling of 778920 in words is "seven hundred seventy-eight thousand, nine hundred twenty".