90690 has 16 divisors (see below), whose sum is σ = 217728. Its totient is φ = 24176.

The previous prime is 90679. The next prime is 90697. The reversal of 90690 is 9609.

It is a super-2 number, since 2×90690² = 16449352200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90690.

It is not an unprimeable number, because it can be changed into a prime (90697) by changing a digit.

90690 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 7 ways as a sum of consecutive naturals, for example, 1482 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2⁹⁰⁶⁹⁰ is an apocalyptic number.

90690 is an abundant number, since it is smaller than the sum of its proper divisors (127038).

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 (108864).

90690 is a wasteful number, since it uses less digits than its factorization.

90690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 90690 is about 301.1478042424. The cubic root of 90690 is about 44.9282808193.

It can be divided in two parts, 90 and 690, that added together give a triangular number (780 = T₃₉).

The spelling of 90690 in words is "ninety thousand, six hundred ninety".