640500098 has 8 divisors (see below), whose sum is σ = 1098000192. Its totient is φ = 274500036.

The previous prime is 640500097. The next prime is 640500131. The reversal of 640500098 is 890005046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (640500097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22874990 + ... + 22875017.

It is an arithmetic number, because the mean of its divisors is an integer number (137250024).

Almost surely, 2^640500098 is an apocalyptic number.

640500098 is a deficient number, since it is larger than the sum of its proper divisors (457500094).

640500098 is a wasteful number, since it uses less digits than its factorization.

640500098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45750016.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 640500098 is about 25308.1034058264. The cubic root of 640500098 is about 861.9982818390.

The spelling of 640500098 in words is "six hundred forty million, five hundred thousand, ninety-eight".