39771728064 has 168 divisors, whose sum is σ = 120633207552. Its totient is φ = 12501941760.

The previous prime is 39771728047. The next prime is 39771728099. The reversal of 39771728064 is 46082717793.

39771728064 is a `hidden beast` number, since 397 + 7 + 172 + 80 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 39771728064.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 919467 + ... + 961749.

Almost surely, 2^39771728064 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 39771728064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60316603776).

39771728064 is an abundant number, since it is smaller than the sum of its proper divisors (80861479488).

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

39771728064 is a wasteful number, since it uses less digits than its factorization.

39771728064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42395 (or 42382 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 39771728064 in words is "thirty-nine billion, seven hundred seventy-one million, seven hundred twenty-eight thousand, sixty-four".