640871735916724 has 48 divisors (see below), whose sum is σ = 1233508157150976. Its totient is φ = 289490418748800.

The previous prime is 640871735916619. The next prime is 640871735916767. The reversal of 640871735916724 is 427619537178046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227310919 + ... + 230113009.

It is an arithmetic number, because the mean of its divisors is an integer number (25698086607312).

It is a 1-persistent number, because it is pandigital, but 2⋅640871735916724 = 1281743471833448 is not.

Almost surely, 2^{640871735916724} is an apocalyptic number.

It is an amenable number.

640871735916724 is a deficient number, since it is larger than the sum of its proper divisors (592636421234252).

640871735916724 is a wasteful number, since it uses less digits than its factorization.

640871735916724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895736 (or 2895734 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 70.

The spelling of 640871735916724 in words is "six hundred forty trillion, eight hundred seventy-one billion, seven hundred thirty-five million, nine hundred sixteen thousand, seven hundred twenty-four".