640093433 has 4 divisors (see below), whose sum is σ = 731535360. Its totient is φ = 548651508.

The previous prime is 640093417. The next prime is 640093457. The reversal of 640093433 is 334390046.

It is a happy number.

640093433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 640093433 - 2⁴ = 640093417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640093433.

It is not an unprimeable number, because it can be changed into a prime (640093403) 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, 45720953 + ... + 45720966.

It is an arithmetic number, because the mean of its divisors is an integer number (182883840).

Almost surely, 2^640093433 is an apocalyptic number.

It is an amenable number.

640093433 is a deficient number, since it is larger than the sum of its proper divisors (91441927).

640093433 is an equidigital number, since it uses as much as digits as its factorization.

640093433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91441926.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 640093433 is about 25300.0678457588. The cubic root of 640093433 is about 861.8158104922.

The spelling of 640093433 in words is "six hundred forty million, ninety-three thousand, four hundred thirty-three".