640774103 has 4 divisors (see below), whose sum is σ = 658092360. Its totient is φ = 623455848.

The previous prime is 640774097. The next prime is 640774129. The reversal of 640774103 is 301477046.

It is a happy number.

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 640774103 - 2⁶ = 640774039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640774103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640774153) 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, 8659073 + ... + 8659146.

It is an arithmetic number, because the mean of its divisors is an integer number (164523090).

Almost surely, 2^640774103 is an apocalyptic number.

640774103 is a deficient number, since it is larger than the sum of its proper divisors (17318257).

640774103 is a wasteful number, since it uses less digits than its factorization.

640774103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17318256.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 640774103 is about 25313.5162117000. The cubic root of 640774103 is about 862.1211848472.

The spelling of 640774103 in words is "six hundred forty million, seven hundred seventy-four thousand, one hundred three".