381450218728 has 32 divisors (see below), whose sum is σ = 718779789000. Its totient is φ = 189777530880.

The previous prime is 381450218713. The next prime is 381450218729. The reversal of 381450218728 is 827812054183.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 314629002724 + 66821216004 = 560918^2 + 258498^2 .

It is not an unprimeable number, because it can be changed into a prime (381450218729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1474168 + ... + 1713496.

Almost surely, 2^381450218728 is an apocalyptic number.

It is an amenable number.

381450218728 is a deficient number, since it is larger than the sum of its proper divisors (337329570272).

381450218728 is a wasteful number, since it uses less digits than its factorization.

381450218728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240325 (or 240321 counting only the distinct ones).

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

The spelling of 381450218728 in words is "three hundred eighty-one billion, four hundred fifty million, two hundred eighteen thousand, seven hundred twenty-eight".