8440783728 has 160 divisors (see below), whose sum is σ = 24227782656. Its totient is φ = 2515774464.

The previous prime is 8440783709. The next prime is 8440783739. The reversal of 8440783728 is 8273870448.

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 31 ways as a sum of consecutive naturals, for example, 3406426 + ... + 3408902.

Almost surely, 2^8440783728 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 8440783728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12113891328).

8440783728 is an abundant number, since it is smaller than the sum of its proper divisors (15786998928).

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

8440783728 is a wasteful number, since it uses less digits than its factorization.

8440783728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 2665 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 51.

The square root of 8440783728 is about 91873.7379668423. The cubic root of 8440783728 is about 2036.0772792037.

The spelling of 8440783728 in words is "eight billion, four hundred forty million, seven hundred eighty-three thousand, seven hundred twenty-eight".