43261581440 has 128 divisors (see below), whose sum is σ = 128942133120. Its totient is φ = 13484113920.

The previous prime is 43261581431. The next prime is 43261581463. The reversal of 43261581440 is 4418516234.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 43261581394 and 43261581403.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 389657 + ... + 488216.

It is an arithmetic number, because the mean of its divisors is an integer number (1007360415).

Almost surely, 2^43261581440 is an apocalyptic number.

43261581440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43261581440 is an abundant number, since it is smaller than the sum of its proper divisors (85680551680).

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

43261581440 is a wasteful number, since it uses less digits than its factorization.

43261581440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877910 (or 877898 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 43261581440 in words is "forty-three billion, two hundred sixty-one million, five hundred eighty-one thousand, four hundred forty".