40420032320 has 56 divisors (see below), whose sum is σ = 101911992264. Its totient is φ = 15216951296.

The previous prime is 40420032319. The next prime is 40420032343. The reversal of 40420032320 is 2323002404.

It can be written as a sum of positive squares in 4 ways, for example, as 9797832256 + 30622200064 = 98984^2 + 174992^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 40420032292 and 40420032301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3709637 + ... + 3720516.

Almost surely, 2^40420032320 is an apocalyptic number.

40420032320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40420032320 is an abundant number, since it is smaller than the sum of its proper divisors (61491959944).

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

40420032320 is a wasteful number, since it uses less digits than its factorization.

40420032320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7430187 (or 7430177 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 40420032320 its reverse (2323002404), we get a palindrome (42743034724).

The spelling of 40420032320 in words is "forty billion, four hundred twenty million, thirty-two thousand, three hundred twenty".