326640431 has 32 divisors (see below), whose sum is σ = 385378560. Its totient is φ = 274120704.

The previous prime is 326640407. The next prime is 326640437. The reversal of 326640431 is 134046623.

It is not a de Polignac number, because 326640431 - 2¹⁰ = 326639407 is a prime.

It is a super-2 number, since 2×326640431² = 213387942327731522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 326640394 and 326640403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326640437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 925151 + ... + 925503.

It is an arithmetic number, because the mean of its divisors is an integer number (12043080).

Almost surely, 2^326640431 is an apocalyptic number.

326640431 is a deficient number, since it is larger than the sum of its proper divisors (58738129).

326640431 is a wasteful number, since it uses less digits than its factorization.

326640431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 326640431 is about 18073.1964798704. The cubic root of 326640431 is about 688.6892648159.

The spelling of 326640431 in words is "three hundred twenty-six million, six hundred forty thousand, four hundred thirty-one".