40320431232 has 128 divisors (see below), whose sum is σ = 113253880320. Its totient is φ = 12689203200.

The previous prime is 40320431189. The next prime is 40320431269. The reversal of 40320431232 is 23213402304.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446758 + ... + 529370.

It is an arithmetic number, because the mean of its divisors is an integer number (884795940).

Almost surely, 2^40320431232 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 40320431232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56626940160).

40320431232 is an abundant number, since it is smaller than the sum of its proper divisors (72933449088).

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

40320431232 is a wasteful number, since it uses less digits than its factorization.

40320431232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82702 (or 82690 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 40320431232 its reverse (23213402304), we get a palindrome (63533833536).

The spelling of 40320431232 in words is "forty billion, three hundred twenty million, four hundred thirty-one thousand, two hundred thirty-two".