81071288 has 16 divisors (see below), whose sum is σ = 152189880. Its totient is φ = 40487328.

The previous prime is 81071281. The next prime is 81071311. The reversal of 81071288 is 88217018.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81071281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670 + ... + 12842.

Almost surely, 2^81071288 is an apocalyptic number.

It is an amenable number.

81071288 is a deficient number, since it is larger than the sum of its proper divisors (71118592).

81071288 is a wasteful number, since it uses less digits than its factorization.

81071288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12086 (or 12082 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 81071288 is about 9003.9595734321. The cubic root of 81071288 is about 432.8017660794.

The spelling of 81071288 in words is "eighty-one million, seventy-one thousand, two hundred eighty-eight".