90724 has 12 divisors (see below), whose sum is σ = 163324. Its totient is φ = 44064.
The previous prime is 90709. The next prime is 90731. The reversal of 90724 is 42709.
It can be written as a sum of positive squares in 2 ways, for example, as 33124 + 57600 = 182^2 + 240^2 .
It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.
It is a junction number, because it is equal to n+sod(n) for n = 90695 and 90704.
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 3 ways as a sum of consecutive naturals, for example, 159 + ... + 454.
290724 is an apocalyptic number.
It is an amenable number.
90724 is a deficient number, since it is larger than the sum of its proper divisors (72600).
90724 is a wasteful number, since it uses less digits than its factorization.
90724 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 654 (or 652 counting only the distinct ones).
The product of its (nonzero) digits is 504, while the sum is 22.
The square root of 90724 is about 301.2042496380. The cubic root of 90724 is about 44.9338947080.
The spelling of 90724 in words is "ninety thousand, seven hundred twenty-four".
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