38909486720 has 128 divisors (see below), whose sum is σ = 100839876480. Its totient is φ = 14270976000.

The previous prime is 38909486689. The next prime is 38909486753. The reversal of 38909486720 is 2768490983.

It is a happy number.

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

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, 1240835 + ... + 1271805.

It is an arithmetic number, because the mean of its divisors is an integer number (787811535).

Almost surely, 2^38909486720 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 38909486720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50419938240).

38909486720 is an abundant number, since it is smaller than the sum of its proper divisors (61930389760).

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

38909486720 is a wasteful number, since it uses less digits than its factorization.

38909486720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31154 (or 31142 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 38909486720 in words is "thirty-eight billion, nine hundred nine million, four hundred eighty-six thousand, seven hundred twenty".