43640998128 has 320 divisors, whose sum is σ = 154523443200. Its totient is φ = 11483596800.

The previous prime is 43640998081. The next prime is 43640998151. The reversal of 43640998128 is 82189904634.

43640998128 is a `hidden beast` number, since 436 + 40 + 99 + 81 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22367553 + ... + 22369503.

It is an arithmetic number, because the mean of its divisors is an integer number (482885760).

Almost surely, 2^43640998128 is an apocalyptic number.

43640998128 is a gapful number since it is divisible by the number (48) 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 43640998128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77261721600).

43640998128 is an abundant number, since it is smaller than the sum of its proper divisors (110882445072).

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

43640998128 is a wasteful number, since it uses less digits than its factorization.

43640998128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557 (or 2545 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 43640998128 in words is "forty-three billion, six hundred forty million, nine hundred ninety-eight thousand, one hundred twenty-eight".