640133403 has 24 divisors (see below), whose sum is σ = 1069237008. Its totient is φ = 337651776.

The previous prime is 640133371. The next prime is 640133407. The reversal of 640133403 is 304331046.

640133403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640133403 - 2⁵ = 640133371 is a prime.

It is a super-3 number, since 3×640133403³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (640133407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165576 + ... + 169397.

It is an arithmetic number, because the mean of its divisors is an integer number (44551542).

Almost surely, 2^640133403 is an apocalyptic number.

640133403 is a deficient number, since it is larger than the sum of its proper divisors (429103605).

640133403 is a wasteful number, since it uses less digits than its factorization.

640133403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335003 (or 334996 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 640133403 is about 25300.8577522581. The cubic root of 640133403 is about 861.8337485302.

Adding to 640133403 its reverse (304331046), we get a palindrome (944464449).

The spelling of 640133403 in words is "six hundred forty million, one hundred thirty-three thousand, four hundred three".