40668385784 has 64 divisors (see below), whose sum is σ = 82884832800. Its totient is φ = 18706401792.

The previous prime is 40668385717. The next prime is 40668385787. The reversal of 40668385784 is 48758386604.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40668385787) 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, 5392064 + ... + 5399600.

Almost surely, 2^40668385784 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 40668385784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41442416400).

40668385784 is an abundant number, since it is smaller than the sum of its proper divisors (42216447016).

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

40668385784 is a wasteful number, since it uses less digits than its factorization.

40668385784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7889 (or 7859 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 40668385784 in words is "forty billion, six hundred sixty-eight million, three hundred eighty-five thousand, seven hundred eighty-four".