38991637692 has 108 divisors (see below), whose sum is σ = 115006054800. Its totient is φ = 11134198656.

The previous prime is 38991637637. The next prime is 38991637717. The reversal of 38991637692 is 29673619983.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

38991637692 is a `hidden beast` number, since 389 + 9 + 163 + 7 + 6 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21941508 + ... + 21943284.

Almost surely, 2^38991637692 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 38991637692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57503027400).

38991637692 is an abundant number, since it is smaller than the sum of its proper divisors (76014417108).

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

38991637692 is an equidigital number, since it uses as much as digits as its factorization.

38991637692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585 (or 1789 counting only the distinct ones).

The product of its digits is 26453952, while the sum is 63.

Multiplying 38991637692 by its sum of digits (63), we get a square (2456473174596 = 1567314²).

38991637692 divided by its sum of digits (63) gives a square (618914884 = 24878²).

The spelling of 38991637692 in words is "thirty-eight billion, nine hundred ninety-one million, six hundred thirty-seven thousand, six hundred ninety-two".