640432246587 has 8 divisors (see below), whose sum is σ = 975896756736. Its totient is φ = 365961283752.

The previous prime is 640432246523. The next prime is 640432246591. The reversal of 640432246587 is 785642234046.

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

It is not a de Polignac number, because 640432246587 - 2⁶ = 640432246523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640432245587) 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, 15248386803 + ... + 15248386844.

It is an arithmetic number, because the mean of its divisors is an integer number (121987094592).

Almost surely, 2^640432246587 is an apocalyptic number.

640432246587 is a deficient number, since it is larger than the sum of its proper divisors (335464510149).

640432246587 is a wasteful number, since it uses less digits than its factorization.

640432246587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30496773657.

The product of its (nonzero) digits is 7741440, while the sum is 51.

The spelling of 640432246587 in words is "six hundred forty billion, four hundred thirty-two million, two hundred forty-six thousand, five hundred eighty-seven".