788778 has 28 divisors (see below), whose sum is σ = 1777218. Its totient is φ = 262440.

The previous prime is 788761. The next prime is 788779. The reversal of 788778 is 877887.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 88209 = 837^2 + 297^2 .

It is not an unprimeable number, because it can be changed into a prime (788779) by changing a digit.

788778 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1188 + ... + 1728.

2⁷⁸⁸⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 788778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888609).

788778 is an abundant number, since it is smaller than the sum of its proper divisors (988440).

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

788778 is an equidigital number, since it uses as much as digits as its factorization.

788778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 546 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 788778 is about 888.1317469835. The cubic root of 788778 is about 92.3956651702.

The spelling of 788778 in words is "seven hundred eighty-eight thousand, seven hundred seventy-eight".