81072204 has 12 divisors (see below), whose sum is σ = 189168504. Its totient is φ = 27024064.

The previous prime is 81072203. The next prime is 81072239. The reversal of 81072204 is 40227018.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×81072204² = 13145404522835232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81072203) 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, 3377997 + ... + 3378020.

It is an arithmetic number, because the mean of its divisors is an integer number (15764042).

Almost surely, 2^81072204 is an apocalyptic number.

It is an amenable number.

81072204 is an abundant number, since it is smaller than the sum of its proper divisors (108096300).

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

81072204 is a wasteful number, since it uses less digits than its factorization.

81072204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756024 (or 6756022 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 81072204 is about 9004.0104397985. The cubic root of 81072204 is about 432.8033961054.

The spelling of 81072204 in words is "eighty-one million, seventy-two thousand, two hundred four".