709878 has 32 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 206496.

The previous prime is 709871. The next prime is 709879. The reversal of 709878 is 878907.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709871) by changing a digit.

709878 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, 1243 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (50400).

2⁷⁰⁹⁸⁷⁸ is an apocalyptic number.

709878 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 709878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806400).

709878 is an abundant number, since it is smaller than the sum of its proper divisors (902922).

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

709878 is a wasteful number, since it uses less digits than its factorization.

709878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 709878 is about 842.5425805263. The cubic root of 709878 is about 89.2061040016.

The spelling of 709878 in words is "seven hundred nine thousand, eight hundred seventy-eight".