640264103 has 4 divisors (see below), whose sum is σ = 642815208. Its totient is φ = 637713000.

The previous prime is 640264099. The next prime is 640264123. The reversal of 640264103 is 301462046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 640264103 - 2² = 640264099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640264123) 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, 1275176 + ... + 1275677.

It is an arithmetic number, because the mean of its divisors is an integer number (160703802).

Almost surely, 2^640264103 is an apocalyptic number.

640264103 is a deficient number, since it is larger than the sum of its proper divisors (2551105).

640264103 is a wasteful number, since it uses less digits than its factorization.

640264103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551104.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 640264103 is about 25303.4405368124. The cubic root of 640264103 is about 861.8923998494.

The spelling of 640264103 in words is "six hundred forty million, two hundred sixty-four thousand, one hundred three".