640132333 has 4 divisors (see below), whose sum is σ = 640187548. Its totient is φ = 640077120.

The previous prime is 640132291. The next prime is 640132349. The reversal of 640132333 is 333231046.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 39980329 + 600152004 = 6323^2 + 24498^2 .

It is a cyclic number.

It is not a de Polignac number, because 640132333 - 2¹³ = 640124141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640132298 and 640132307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640132373) 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, 2766 + ... + 35887.

It is an arithmetic number, because the mean of its divisors is an integer number (160046887).

Almost surely, 2^640132333 is an apocalyptic number.

It is an amenable number.

640132333 is a deficient number, since it is larger than the sum of its proper divisors (55215).

640132333 is a wasteful number, since it uses less digits than its factorization.

640132333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55214.

The product of its (nonzero) digits is 3888, while the sum is 25.

The square root of 640132333 is about 25300.8366067211. The cubic root of 640132333 is about 861.8332683373.

Adding to 640132333 its reverse (333231046), we get a palindrome (973363379).

The spelling of 640132333 in words is "six hundred forty million, one hundred thirty-two thousand, three hundred thirty-three".