32456559440 has 80 divisors (see below), whose sum is σ = 76731338880. Its totient is φ = 12765150720.

The previous prime is 32456559439. The next prime is 32456559467. The reversal of 32456559440 is 4495565423.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×32456559440² (a number of 22 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2145182 + ... + 2160258.

It is an arithmetic number, because the mean of its divisors is an integer number (959141736).

Almost surely, 2^32456559440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32456559440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38365669440).

32456559440 is an abundant number, since it is smaller than the sum of its proper divisors (44274779440).

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

32456559440 is a wasteful number, since it uses less digits than its factorization.

32456559440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540 (or 15534 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 32456559440 in words is "thirty-two billion, four hundred fifty-six million, five hundred fifty-nine thousand, four hundred forty".