38721581284 has 9 divisors (see below), whose sum is σ = 67763455977. Its totient is φ = 19360593864.

The previous prime is 38721581279. The next prime is 38721581303. The reversal of 38721581284 is 48218512783.

It is a happy number.

The square root of 38721581284 is 196778.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 415262884 + 38306318400 = 20378^2 + 195720^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 344362 + ... + 442750.

Almost surely, 2^38721581284 is an apocalyptic number.

38721581284 is the 196778-th square number.

It is an amenable number.

38721581284 is a deficient number, since it is larger than the sum of its proper divisors (29041874693).

38721581284 is an frugal number, since it uses more digits than its factorization.

38721581284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196782 (or 98391 counting only the distinct ones).

The product of its digits is 860160, while the sum is 49.

Multiplying 38721581284 by its sum of digits (49), we get a square (1897357482916 = 1377446²).

The spelling of 38721581284 in words is "thirty-eight billion, seven hundred twenty-one million, five hundred eighty-one thousand, two hundred eighty-four".