778256028 has 108 divisors (see below), whose sum is σ = 2203811064. Its totient is φ = 231316800.

The previous prime is 778256027. The next prime is 778256029. The reversal of 778256028 is 820652877.

778256028 is a `hidden beast` number, since 7 + 7 + 82 + 560 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (778256027) and next prime (778256029).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778256027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 229183 + ... + 232553.

It is an arithmetic number, because the mean of its divisors is an integer number (20405658).

Almost surely, 2^778256028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778256028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101905532).

778256028 is an abundant number, since it is smaller than the sum of its proper divisors (1425555036).

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

778256028 is a wasteful number, since it uses less digits than its factorization.

778256028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456 (or 3440 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 778256028 is about 27897.2405086955. The cubic root of 778256028 is about 919.8298472344.

The spelling of 778256028 in words is "seven hundred seventy-eight million, two hundred fifty-six thousand, twenty-eight".