38444067891 has 48 divisors (see below), whose sum is σ = 57257085600. Its totient is φ = 24847865856.

The previous prime is 38444067847. The next prime is 38444067917. The reversal of 38444067891 is 19876044483.

38444067891 is a `hidden beast` number, since 3 + 84 + 4 + 406 + 78 + 91 = 666.

It is not a de Polignac number, because 38444067891 - 2¹⁷ = 38443936819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38444067821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10464831 + ... + 10468503.

It is an arithmetic number, because the mean of its divisors is an integer number (1192855950).

Almost surely, 2^38444067891 is an apocalyptic number.

38444067891 is a deficient number, since it is larger than the sum of its proper divisors (18813017709).

38444067891 is a wasteful number, since it uses less digits than its factorization.

38444067891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020 (or 4017 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 38444067891 in words is "thirty-eight billion, four hundred forty-four million, sixty-seven thousand, eight hundred ninety-one".