326640 has 40 divisors (see below), whose sum is σ = 1013328. Its totient is φ = 87040.

The previous prime is 326633. The next prime is 326657. The reversal of 326640 is 46623.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

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 326640.

It is an unprimeable number.

326640 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, 441 + ... + 920.

2³²⁶⁶⁴⁰ is an apocalyptic number.

326640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

326640 is an abundant number, since it is smaller than the sum of its proper divisors (686688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

326640 is a wasteful number, since it uses less digits than its factorization.

326640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 326640 is about 571.5242776996. The cubic root of 326640 is about 68.8688961909.

The spelling of 326640 in words is "three hundred twenty-six thousand, six hundred forty".