791778 has 16 divisors (see below), whose sum is σ = 1705536. Its totient is φ = 243600.

The previous prime is 791773. The next prime is 791783. The reversal of 791778 is 877197.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (791773) and next prime (791783).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (791773) by changing a digit.

791778 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, 4998 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (106596).

2⁷⁹¹⁷⁷⁸ is an apocalyptic number.

791778 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

791778 is an abundant number, since it is smaller than the sum of its proper divisors (913758).

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

791778 is a wasteful number, since it uses less digits than its factorization.

791778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10169.

The product of its digits is 24696, while the sum is 39.

The square root of 791778 is about 889.8190827354. The cubic root of 791778 is about 92.5126547089.

791778 divided by its sum of digits (39) gives a palindrome (20302).

The spelling of 791778 in words is "seven hundred ninety-one thousand, seven hundred seventy-eight".