90890 has 16 divisors (see below), whose sum is σ = 167400. Its totient is φ = 35520.

The previous prime is 90887. The next prime is 90901. The reversal of 90890 is 9809.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27889 + 63001 = 167^2 + 251^2 .

It is an unprimeable 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, 536 + ... + 684.

2⁹⁰⁸⁹⁰ is an apocalyptic number.

90890 is a deficient number, since it is larger than the sum of its proper divisors (76510).

90890 is a wasteful number, since it uses less digits than its factorization.

90890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 90890 is about 301.4796842243. The cubic root of 90890 is about 44.9612835717.

The spelling of 90890 in words is "ninety thousand, eight hundred ninety".