64232643420 has 144 divisors (see below), whose sum is σ = 212814096768. Its totient is φ = 15552324480.

The previous prime is 64232643407. The next prime is 64232643443. The reversal of 64232643420 is 2434623246.

64232643420 is a `hidden beast` number, since 6 + 4 + 2 + 3 + 2 + 643 + 4 + 2 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1617847 + ... + 1657073.

It is an arithmetic number, because the mean of its divisors is an integer number (1477875672).

Almost surely, 2^64232643420 is an apocalyptic number.

64232643420 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 64232643420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106407048384).

64232643420 is an abundant number, since it is smaller than the sum of its proper divisors (148581453348).

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

64232643420 is a wasteful number, since it uses less digits than its factorization.

64232643420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40080 (or 40075 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

The spelling of 64232643420 in words is "sixty-four billion, two hundred thirty-two million, six hundred forty-three thousand, four hundred twenty".