640477158 has 16 divisors (see below), whose sum is σ = 1293638256. Its totient is φ = 211378400.

The previous prime is 640477147. The next prime is 640477163. The reversal of 640477158 is 851774046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527841 + ... + 529052.

It is an arithmetic number, because the mean of its divisors is an integer number (80852391).

Almost surely, 2^640477158 is an apocalyptic number.

640477158 is an abundant number, since it is smaller than the sum of its proper divisors (653161098).

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

640477158 is a wasteful number, since it uses less digits than its factorization.

640477158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056999.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 640477158 is about 25307.6501872458. The cubic root of 640477158 is about 861.9879906740.

The spelling of 640477158 in words is "six hundred forty million, four hundred seventy-seven thousand, one hundred fifty-eight".