69990 has 16 divisors (see below), whose sum is σ = 168048. Its totient is φ = 18656.

The previous prime is 69959. The next prime is 69991. The reversal of 69990 is 9996.

It is a Curzon number.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

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 69990.

It is not an unprimeable number, because it can be changed into a prime (69991) by changing a digit.

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, 1137 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (10503).

2⁶⁹⁹⁹⁰ is an apocalyptic number.

69990 is an abundant number, since it is smaller than the sum of its proper divisors (98058).

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 (84024).

69990 is a wasteful number, since it uses less digits than its factorization.

69990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 69990 is about 264.5562322078. The cubic root of 69990 is about 41.2108903878.

The spelling of 69990 in words is "sixty-nine thousand, nine hundred ninety".