640511270 has 16 divisors (see below), whose sum is σ = 1317623328. Its totient is φ = 219603840.

The previous prime is 640511239. The next prime is 640511293. The reversal of 640511270 is 72115046.

640511270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 4575011 + ... + 4575150.

It is an arithmetic number, because the mean of its divisors is an integer number (82351458).

Almost surely, 2^640511270 is an apocalyptic number.

640511270 is an abundant number, since it is smaller than the sum of its proper divisors (677112058).

640511270 is a wasteful number, since it uses less digits than its factorization.

640511270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9150175.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 640511270 is about 25308.3241246828. The cubic root of 640511270 is about 862.0032936461.

The spelling of 640511270 in words is "six hundred forty million, five hundred eleven thousand, two hundred seventy".