81026506 has 16 divisors (see below), whose sum is σ = 135092448. Its totient is φ = 36134800.

The previous prime is 81026503. The next prime is 81026527. The reversal of 81026506 is 60562018.

It is not an unprimeable number, because it can be changed into a prime (81026501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33580 + ... + 35911.

It is an arithmetic number, because the mean of its divisors is an integer number (8443278).

Almost surely, 2^81026506 is an apocalyptic number.

81026506 is a deficient number, since it is larger than the sum of its proper divisors (54065942).

81026506 is a wasteful number, since it uses less digits than its factorization.

81026506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69557.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81026506 is about 9001.4724351075. The cubic root of 81026506 is about 432.7220613367.

The spelling of 81026506 in words is "eighty-one million, twenty-six thousand, five hundred six".