64431265860 has 384 divisors, whose sum is σ = 220544217600. Its totient is φ = 15519651840.

The previous prime is 64431265817. The next prime is 64431265867. The reversal of 64431265860 is 6856213446.

64431265860 is a `hidden beast` number, since 6 + 4 + 43 + 1 + 26 + 586 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64431265867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 162295182 + ... + 162295578.

It is an arithmetic number, because the mean of its divisors is an integer number (574333900).

Almost surely, 2^64431265860 is an apocalyptic number.

64431265860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64431265860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110272108800).

64431265860 is an abundant number, since it is smaller than the sum of its proper divisors (156112951740).

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

64431265860 is a wasteful number, since it uses less digits than its factorization.

64431265860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 64431265860 in words is "sixty-four billion, four hundred thirty-one million, two hundred sixty-five thousand, eight hundred sixty".