81208244 has 12 divisors (see below), whose sum is σ = 153046404. Its totient is φ = 37480704.

The previous prime is 81208217. The next prime is 81208247. The reversal of 81208244 is 44280218.

It can be written as a sum of positive squares in 2 ways, for example, as 48832144 + 32376100 = 6988^2 + 5690^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81208247) 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, 780797 + ... + 780900.

It is an arithmetic number, because the mean of its divisors is an integer number (12753867).

Almost surely, 2^81208244 is an apocalyptic number.

It is an amenable number.

81208244 is a deficient number, since it is larger than the sum of its proper divisors (71838160).

81208244 is a wasteful number, since it uses less digits than its factorization.

81208244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561714 (or 1561712 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 81208244 is about 9011.5616848580. The cubic root of 81208244 is about 433.0453436897.

The spelling of 81208244 in words is "eighty-one million, two hundred eight thousand, two hundred forty-four".