640485061 has 4 divisors (see below), whose sum is σ = 651340800. Its totient is φ = 629629324.

The previous prime is 640485023. The next prime is 640485077. The reversal of 640485061 is 160584046.

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 640485061 - 2²⁵ = 606930629 is a prime.

It is a super-2 number, since 2×640485061² = 820442226728347442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640485011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5427781 + ... + 5427898.

It is an arithmetic number, because the mean of its divisors is an integer number (162835200).

Almost surely, 2^640485061 is an apocalyptic number.

It is an amenable number.

640485061 is a deficient number, since it is larger than the sum of its proper divisors (10855739).

640485061 is a wasteful number, since it uses less digits than its factorization.

640485061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10855738.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 640485061 is about 25307.8063253218. The cubic root of 640485061 is about 861.9915360843.

The spelling of 640485061 in words is "six hundred forty million, four hundred eighty-five thousand, sixty-one".