39664803840 has 224 divisors, whose sum is σ = 130031739936. Its totient is φ = 10317987840.

The previous prime is 39664803811. The next prime is 39664803887. The reversal of 39664803840 is 4830846693.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5034144 + ... + 5042016.

It is an arithmetic number, because the mean of its divisors is an integer number (580498839).

Almost surely, 2^39664803840 is an apocalyptic number.

39664803840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39664803840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65015869968).

39664803840 is an abundant number, since it is smaller than the sum of its proper divisors (90366936096).

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

39664803840 is an equidigital number, since it uses as much as digits as its factorization.

39664803840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948 (or 7924 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 39664803840 in words is "thirty-nine billion, six hundred sixty-four million, eight hundred three thousand, eight hundred forty".