640771045 has 8 divisors (see below), whose sum is σ = 772790400. Its totient is φ = 510040080.

The previous prime is 640771031. The next prime is 640771063. The reversal of 640771045 is 540177046.

It is a happy number.

640771045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640771045 - 2⁵ = 640771013 is a prime.

It is a super-2 number, since 2×640771045² = 821175064220784050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640771045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321001 + ... + 322990.

It is an arithmetic number, because the mean of its divisors is an integer number (96598800).

Almost surely, 2^640771045 is an apocalyptic number.

It is an amenable number.

640771045 is a deficient number, since it is larger than the sum of its proper divisors (132019355).

640771045 is a wasteful number, since it uses less digits than its factorization.

640771045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644195.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 640771045 is about 25313.4558091146. The cubic root of 640771045 is about 862.1198133962.

The spelling of 640771045 in words is "six hundred forty million, seven hundred seventy-one thousand, forty-five".