6431712540 has 48 divisors (see below), whose sum is σ = 19645960320. Its totient is φ = 1559202880.

The previous prime is 6431712491. The next prime is 6431712607. The reversal of 6431712540 is 452171346.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 4871850 + ... + 4873169.

It is an arithmetic number, because the mean of its divisors is an integer number (409290840).

Almost surely, 2^6431712540 is an apocalyptic number.

6431712540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6431712540 is an abundant number, since it is smaller than the sum of its proper divisors (13214247780).

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

6431712540 is a wasteful number, since it uses less digits than its factorization.

6431712540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9745042 (or 9745040 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 6431712540 is about 80197.9584528185. The cubic root of 6431712540 is about 1859.6970775037.

Adding to 6431712540 its reverse (452171346), we get a palindrome (6883883886).

The spelling of 6431712540 in words is "six billion, four hundred thirty-one million, seven hundred twelve thousand, five hundred forty".