640173100 has 36 divisors (see below), whose sum is σ = 1587631024. Its totient is φ = 219487680.

The previous prime is 640173089. The next prime is 640173109. The reversal of 640173100 is 1371046.

It is a super-2 number, since 2×640173100² = 819643195927220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640173109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456567 + ... + 457966.

Almost surely, 2^640173100 is an apocalyptic number.

It is an amenable number.

640173100 is an abundant number, since it is smaller than the sum of its proper divisors (947457924).

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

640173100 is a wasteful number, since it uses less digits than its factorization.

640173100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914554 (or 914547 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 640173100 is about 25301.6422391907. The cubic root of 640173100 is about 861.8515633102.

The spelling of 640173100 in words is "six hundred forty million, one hundred seventy-three thousand, one hundred".