6431420736 has 252 divisors, whose sum is σ = 20709404352. Its totient is φ = 1978089984.

The previous prime is 6431420719. The next prime is 6431420753. The reversal of 6431420736 is 6370241346.

It is a happy number.

6431420736 is a `hidden beast` number, since 643 + 1 + 4 + 2 + 0 + 7 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (6431420719) and next prime (6431420753).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6431420736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2627065 + ... + 2629511.

It is an arithmetic number, because the mean of its divisors is an integer number (82180176).

Almost surely, 2^6431420736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6431420736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10354702176).

6431420736 is an abundant number, since it is smaller than the sum of its proper divisors (14277983616).

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

6431420736 is a wasteful number, since it uses less digits than its factorization.

6431420736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2465 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 6431420736 is about 80196.1391589396. The cubic root of 6431420736 is about 1859.6689525292.

The spelling of 6431420736 in words is "six billion, four hundred thirty-one million, four hundred twenty thousand, seven hundred thirty-six".