640623059 has 4 divisors (see below), whose sum is σ = 640928640. Its totient is φ = 640317480.

The previous prime is 640623043. The next prime is 640623077. The reversal of 640623059 is 950326046.

640623059 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 an emirpimes, since its reverse is a distinct semiprime: 950326046 = 2 ⋅475163023.

It is a cyclic number.

It is not a de Polignac number, because 640623059 - 2⁴ = 640623043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640620059) 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, 149624 + ... + 153845.

It is an arithmetic number, because the mean of its divisors is an integer number (160232160).

Almost surely, 2^640623059 is an apocalyptic number.

640623059 is a deficient number, since it is larger than the sum of its proper divisors (305581).

640623059 is a wasteful number, since it uses less digits than its factorization.

640623059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305580.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 640623059 is about 25310.5325704537. The cubic root of 640623059 is about 862.0534394620.

The spelling of 640623059 in words is "six hundred forty million, six hundred twenty-three thousand, fifty-nine".