640106588 has 12 divisors (see below), whose sum is σ = 1222021752. Its totient is φ = 290957520.

The previous prime is 640106587. The next prime is 640106591. The reversal of 640106588 is 885601046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640106587) 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, 7273895 + ... + 7273982.

It is an arithmetic number, because the mean of its divisors is an integer number (101835146).

Almost surely, 2^640106588 is an apocalyptic number.

It is an amenable number.

640106588 is a deficient number, since it is larger than the sum of its proper divisors (581915164).

640106588 is a wasteful number, since it uses less digits than its factorization.

640106588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14547892 (or 14547890 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 640106588 is about 25300.3278239631. The cubic root of 640106588 is about 861.8217143748.

The spelling of 640106588 in words is "six hundred forty million, one hundred six thousand, five hundred eighty-eight".