69978 has 16 divisors (see below), whose sum is σ = 142560. Its totient is φ = 22896.

The previous prime is 69959. The next prime is 69991. The reversal of 69978 is 87996.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 69978.

It is an unprimeable number.

69978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588 + ... + 696.

It is an arithmetic number, because the mean of its divisors is an integer number (8910).

2⁶⁹⁹⁷⁸ is an apocalyptic number.

69978 is an abundant number, since it is smaller than the sum of its proper divisors (72582).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71280).

69978 is a wasteful number, since it uses less digits than its factorization.

69978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221.

The product of its digits is 27216, while the sum is 39.

The square root of 69978 is about 264.5335517472. The cubic root of 69978 is about 41.2085350087.

It can be divided in two parts, 699 and 78, that added together give a palindrome (777).

The spelling of 69978 in words is "sixty-nine thousand, nine hundred seventy-eight".