38721280 has 108 divisors (see below), whose sum is σ = 100994040. Its totient is φ = 14217216.

The previous prime is 38721271. The next prime is 38721281. The reversal of 38721280 is 8212783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38721281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216231 + ... + 216409.

It is an arithmetic number, because the mean of its divisors is an integer number (935130).

Almost surely, 2^38721280 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 38721280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50497020).

38721280 is an abundant number, since it is smaller than the sum of its proper divisors (62272760).

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

38721280 is a wasteful number, since it uses less digits than its factorization.

38721280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 38721280 is about 6222.6425254871. The cubic root of 38721280 is about 338.3113501912.

The spelling of 38721280 in words is "thirty-eight million, seven hundred twenty-one thousand, two hundred eighty".