326199640 has 64 divisors (see below), whose sum is σ = 796269600. Its totient is φ = 119549952.

The previous prime is 326199637. The next prime is 326199647. The reversal of 326199640 is 46991623.

It is a super-2 number, since 2×326199640² = 212812410272259200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 326199593 and 326199602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326199647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70024 + ... + 74536.

Almost surely, 2^326199640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 326199640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398134800).

326199640 is an abundant number, since it is smaller than the sum of its proper divisors (470069960).

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

326199640 is a wasteful number, since it uses less digits than its factorization.

326199640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 326199640 is about 18060.9977575991. The cubic root of 326199640 is about 688.3793371858.

The spelling of 326199640 in words is "three hundred twenty-six million, one hundred ninety-nine thousand, six hundred forty".