779988 has 48 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 223200.

The previous prime is 779983. The next prime is 779993. The reversal of 779988 is 889977.

It is an interprime number because it is at equal distance from previous prime (779983) and next prime (779993).

It is a zygodrome in base 10.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 779988.

It is not an unprimeable number, because it can be changed into a prime (779981) by changing a digit.

779988 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 15 ways as a sum of consecutive naturals, for example, 2353 + ... + 2663.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁷⁷⁹⁹⁸⁸ 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 779988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048320).

779988 is an abundant number, since it is smaller than the sum of its proper divisors (1316652).

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

779988 is a wasteful number, since it uses less digits than its factorization.

779988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 346 counting only the distinct ones).

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

The square root of 779988 is about 883.1692929445. The cubic root of 779988 is about 92.0511687630.

It can be divided in two parts, 7799 and 88, that added together give a palindrome (7887).

The spelling of 779988 in words is "seven hundred seventy-nine thousand, nine hundred eighty-eight".