640454326 has 8 divisors (see below), whose sum is σ = 960859440. Its totient is φ = 320167848.

The previous prime is 640454267. The next prime is 640454329. The reversal of 640454326 is 623454046.

640454326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×640454326² = 820363487384228552, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640454291 and 640454300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640454329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14641 + ... + 38668.

It is an arithmetic number, because the mean of its divisors is an integer number (120107430).

Almost surely, 2^640454326 is an apocalyptic number.

640454326 is a deficient number, since it is larger than the sum of its proper divisors (320405114).

640454326 is a wasteful number, since it uses less digits than its factorization.

640454326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59318.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 640454326 is about 25307.1990943289. The cubic root of 640454326 is about 861.9777477150.

The spelling of 640454326 in words is "six hundred forty million, four hundred fifty-four thousand, three hundred twenty-six".