7931783040 has 128 divisors (see below), whose sum is σ = 26154554400. Its totient is φ = 2042191872.

The previous prime is 7931783029. The next prime is 7931783047. The reversal of 7931783040 is 403871397.

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

It is a junction number, because it is equal to n+sod(n) for n = 7931782983 and 7931783001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7931783047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15547 + ... + 126906.

Almost surely, 2^7931783040 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 7931783040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13077277200).

7931783040 is an abundant number, since it is smaller than the sum of its proper divisors (18222771360).

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

7931783040 is a wasteful number, since it uses less digits than its factorization.

7931783040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142504 (or 142492 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 7931783040 is about 89060.5582735702. The cubic root of 7931783040 is about 1994.2990181772.

The spelling of 7931783040 in words is "seven billion, nine hundred thirty-one million, seven hundred eighty-three thousand, forty".