40239220728 has 512 divisors, whose sum is σ = 132657315840. Its totient is φ = 9902407680.

The previous prime is 40239220649. The next prime is 40239220729. The reversal of 40239220728 is 82702293204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40239220729) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 180444825 + ... + 180445047.

It is an arithmetic number, because the mean of its divisors is an integer number (259096320).

Almost surely, 2^40239220728 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 40239220728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66328657920).

40239220728 is an abundant number, since it is smaller than the sum of its proper divisors (92418095112).

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

40239220728 is a wasteful number, since it uses less digits than its factorization.

40239220728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 40239220728 in words is "forty billion, two hundred thirty-nine million, two hundred twenty thousand, seven hundred twenty-eight".