640711152 has 60 divisors (see below), whose sum is σ = 1854944520. Its totient is φ = 206204544.

The previous prime is 640711133. The next prime is 640711189. The reversal of 640711152 is 251117046.

It is a happy number.

640711152 is a `hidden beast` number, since 640 + 7 + 1 + 1 + 15 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72538 + ... + 80889.

It is an arithmetic number, because the mean of its divisors is an integer number (30915742).

Almost surely, 2^640711152 is an apocalyptic number.

It is an amenable number.

640711152 is an abundant number, since it is smaller than the sum of its proper divisors (1214233368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640711152 is a wasteful number, since it uses less digits than its factorization.

640711152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153470 (or 153461 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 640711152 is about 25312.2727545355. The cubic root of 640711152 is about 862.0929517212.

Adding to 640711152 its reverse (251117046), we get a palindrome (891828198).

The spelling of 640711152 in words is "six hundred forty million, seven hundred eleven thousand, one hundred fifty-two".