81026536 has 8 divisors (see below), whose sum is σ = 151924770. Its totient is φ = 40513264.

The previous prime is 81026531. The next prime is 81026597. The reversal of 81026536 is 63562018.

It can be written as a sum of positive squares in only one way, i.e., 76212900 + 4813636 = 8730^2 + 2194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81026498 and 81026507.

It is not an unprimeable number, because it can be changed into a prime (81026531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064151 + ... + 5064166.

Almost surely, 2^81026536 is an apocalyptic number.

It is an amenable number.

81026536 is a deficient number, since it is larger than the sum of its proper divisors (70898234).

81026536 is a wasteful number, since it uses less digits than its factorization.

81026536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10128323 (or 10128319 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 81026536 is about 9001.4741015014. The cubic root of 81026536 is about 432.7221147417.

The spelling of 81026536 in words is "eighty-one million, twenty-six thousand, five hundred thirty-six".