81209082 has 16 divisors (see below), whose sum is σ = 163588320. Its totient is φ = 26874672.

The previous prime is 81209081. The next prime is 81209087. The reversal of 81209082 is 28090218.

It is not an unprimeable number, because it can be changed into a prime (81209081) 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, 47853 + ... + 49520.

It is an arithmetic number, because the mean of its divisors is an integer number (10224270).

Almost surely, 2^81209082 is an apocalyptic number.

81209082 is an abundant number, since it is smaller than the sum of its proper divisors (82379238).

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

81209082 is a wasteful number, since it uses less digits than its factorization.

81209082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97517.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 81209082 is about 9011.6081805636. The cubic root of 81209082 is about 433.0468332377.

The spelling of 81209082 in words is "eighty-one million, two hundred nine thousand, eighty-two".