640511036 has 12 divisors (see below), whose sum is σ = 1222793880. Its totient is φ = 291141360.

The previous prime is 640511029. The next prime is 640511059. The reversal of 640511036 is 630115046.

640511036 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 640510996 and 640511014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7278491 + ... + 7278578.

It is an arithmetic number, because the mean of its divisors is an integer number (101899490).

Almost surely, 2^640511036 is an apocalyptic number.

It is an amenable number.

640511036 is a deficient number, since it is larger than the sum of its proper divisors (582282844).

640511036 is a wasteful number, since it uses less digits than its factorization.

640511036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14557084 (or 14557082 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 640511036 is about 25308.3195016975. The cubic root of 640511036 is about 862.0031886733.

The spelling of 640511036 in words is "six hundred forty million, five hundred eleven thousand, thirty-six".