869778 has 80 divisors (see below), whose sum is σ = 2439360. Its totient is φ = 225504.

The previous prime is 869777. The next prime is 869779. The reversal of 869778 is 877968.

It is an interprime number because it is at equal distance from previous prime (869777) and next prime (869779).

Its product of digits (169344) is a multiple of the sum of its prime divisors (84).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (869773) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14713 + ... + 14771.

It is an arithmetic number, because the mean of its divisors is an integer number (30492).

2⁸⁶⁹⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 869778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1219680).

869778 is an abundant number, since it is smaller than the sum of its proper divisors (1569582).

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

869778 is a wasteful number, since it uses less digits than its factorization.

869778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 84 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 869778 is about 932.6188932249. The cubic root of 869778 is about 95.4559064741.

The spelling of 869778 in words is "eight hundred sixty-nine thousand, seven hundred seventy-eight".