778231 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 752640.

The previous prime is 778223. The next prime is 778237. The reversal of 778231 is 132877.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 778231 - 2³ = 778223 is a prime.

It is a super-2 number, since 2×778231² = 1211286978722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 778231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778237) 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 7 ways as a sum of consecutive naturals, for example, 6831 + ... + 6943.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁷⁷⁸²³¹ is an apocalyptic number.

778231 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

778231 is a deficient number, since it is larger than the sum of its proper divisors (26153).

778231 is a wasteful number, since it uses less digits than its factorization.

778231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281.

The product of its digits is 2352, while the sum is 28.

The square root of 778231 is about 882.1740191141. The cubic root of 778231 is about 91.9819986834.

The spelling of 778231 in words is "seven hundred seventy-eight thousand, two hundred thirty-one".