640171480 has 32 divisors (see below), whose sum is σ = 1551186000. Its totient is φ = 236370816.

The previous prime is 640171459. The next prime is 640171481. The reversal of 640171480 is 84171046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640171481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615030 + ... + 616069.

Almost surely, 2^640171480 is an apocalyptic number.

It is an amenable number.

640171480 is an abundant number, since it is smaller than the sum of its proper divisors (911014520).

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

640171480 is a wasteful number, since it uses less digits than its factorization.

640171480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231123 (or 1231119 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 640171480 is about 25301.6102254382. The cubic root of 640171480 is about 861.8508363189.

The spelling of 640171480 in words is "six hundred forty million, one hundred seventy-one thousand, four hundred eighty".