81027320 has 32 divisors (see below), whose sum is σ = 198886320. Its totient is φ = 29464320.

The previous prime is 81027313. The next prime is 81027379. The reversal of 81027320 is 2372018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91637 + ... + 92516.

Almost surely, 2^81027320 is an apocalyptic number.

It is an amenable number.

81027320 is an abundant number, since it is smaller than the sum of its proper divisors (117859000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81027320 is a wasteful number, since it uses less digits than its factorization.

81027320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184175 (or 184171 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 81027320 is about 9001.5176498188. The cubic root of 81027320 is about 432.7235103875.

Adding to 81027320 its reverse (2372018), we get a palindrome (83399338).

The spelling of 81027320 in words is "eighty-one million, twenty-seven thousand, three hundred twenty".