8271990381 has 32 divisors (see below), whose sum is σ = 11385354240. Its totient is φ = 5340082176.

The previous prime is 8271990313. The next prime is 8271990437. The reversal of 8271990381 is 1830991728.

It is not a de Polignac number, because 8271990381 - 2⁷ = 8271990253 is a prime.

It is a super-2 number, since 2×8271990381² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8271990381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8271990481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4079890 + ... + 4081916.

It is an arithmetic number, because the mean of its divisors is an integer number (355792320).

Almost surely, 2^8271990381 is an apocalyptic number.

It is an amenable number.

8271990381 is a deficient number, since it is larger than the sum of its proper divisors (3113363859).

8271990381 is a wasteful number, since it uses less digits than its factorization.

8271990381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 8271990381 is about 90950.4831268092. The cubic root of 8271990381 is about 2022.4137388946.

The spelling of 8271990381 in words is "eight billion, two hundred seventy-one million, nine hundred ninety thousand, three hundred eighty-one".