640730502500 has 60 divisors (see below), whose sum is σ = 1528526752368. Its totient is φ = 232992900000.

The previous prime is 640730502491. The next prime is 640730502541. The reversal of 640730502500 is 5205037046.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11622146 + ... + 11677145.

Almost surely, 2^640730502500 is an apocalyptic number.

It is an amenable number.

640730502500 is an abundant number, since it is smaller than the sum of its proper divisors (887796249868).

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

640730502500 is a wasteful number, since it uses less digits than its factorization.

640730502500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23299326 (or 23299309 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

Adding to 640730502500 its reverse (5205037046), we get a palindrome (645935539546).

The spelling of 640730502500 in words is "six hundred forty billion, seven hundred thirty million, five hundred two thousand, five hundred".