80990 has 32 divisors (see below), whose sum is σ = 181440. Its totient is φ = 25344.
The previous prime is 80989. The next prime is 81001. The reversal of 80990 is 9908.
80990 = 112 + 122 + ... + 622.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (26).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 866 + ... + 954.
It is an arithmetic number, because the mean of its divisors is an integer number (5670).
280990 is an apocalyptic number.
80990 is an abundant number, since it is smaller than the sum of its proper divisors (100450).
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 (90720).
80990 is a wasteful number, since it uses less digits than its factorization.
80990 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 116.
The product of its (nonzero) digits is 648, while the sum is 26.
The square root of 80990 is about 284.5874206637. The cubic root of 80990 is about 43.2657064809.
The spelling of 80990 in words is "eighty thousand, nine hundred ninety".
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