778899 has 8 divisors (see below), whose sum is σ = 1132992. Its totient is φ = 472040.

The previous prime is 778879. The next prime is 778903. The reversal of 778899 is 998877.

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 778899 - 2⁸ = 778643 is a prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (778819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11769 + ... + 11834.

It is an arithmetic number, because the mean of its divisors is an integer number (141624).

2⁷⁷⁸⁸⁹⁹ is an apocalyptic number.

778899 is a deficient number, since it is larger than the sum of its proper divisors (354093).

778899 is a wasteful number, since it uses less digits than its factorization.

778899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23617.

The product of its digits is 254016, while the sum is 48.

The square root of 778899 is about 882.5525480106. The cubic root of 778899 is about 92.0083089534.

It can be divided in two parts, 7788 and 99, that added together give a palindrome (7887).

The spelling of 778899 in words is "seven hundred seventy-eight thousand, eight hundred ninety-nine".