43128645840 has 240 divisors, whose sum is σ = 170872206336. Its totient is φ = 9539942400.

The previous prime is 43128645811. The next prime is 43128645949. The reversal of 43128645840 is 4854682134.

43128645840 is a `hidden beast` number, since 4 + 3 + 1 + 2 + 8 + 64 + 584 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18220 + ... + 294260.

Almost surely, 2^43128645840 is an apocalyptic number.

43128645840 is a gapful number since it is divisible by the number (40) 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 43128645840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85436103168).

43128645840 is an abundant number, since it is smaller than the sum of its proper divisors (127743560496).

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

43128645840 is a wasteful number, since it uses less digits than its factorization.

43128645840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276098 (or 276089 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 43128645840 in words is "forty-three billion, one hundred twenty-eight million, six hundred forty-five thousand, eight hundred forty".