778020 has 24 divisors (see below), whose sum is σ = 2178624. Its totient is φ = 207456.

The previous prime is 778013. The next prime is 778027. The reversal of 778020 is 20877.

778020 = T₁₆₃ + T₁₆₄ + ... + T₂₀₇.

It is an interprime number because it is at equal distance from previous prime (778013) and next prime (778027).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (778027) by changing a digit.

778020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6424 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (90776).

2⁷⁷⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

778020 is an abundant number, since it is smaller than the sum of its proper divisors (1400604).

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

778020 is a wasteful number, since it uses less digits than its factorization.

778020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979 (or 12977 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 778020 is about 882.0544200898. The cubic root of 778020 is about 91.9736849753.

Adding to 778020 its reverse (20877), we get a palindrome (798897).

The spelling of 778020 in words is "seven hundred seventy-eight thousand, twenty".