81002272 has 24 divisors (see below), whose sum is σ = 171741276. Its totient is φ = 37385472.

The previous prime is 81002261. The next prime is 81002309. The reversal of 81002272 is 27220018.

81002272 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 71978256 + 9024016 = 8484^2 + 3004^2 .

It is a super-2 number, since 2×81002272² = 13122736138323968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96943 + ... + 97774.

Almost surely, 2^81002272 is an apocalyptic number.

It is an amenable number.

81002272 is an abundant number, since it is smaller than the sum of its proper divisors (90739004).

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

81002272 is a wasteful number, since it uses less digits than its factorization.

81002272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194740 (or 194732 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 81002272 is about 9000.1262213371. The cubic root of 81002272 is about 432.6789164754.

The spelling of 81002272 in words is "eighty-one million, two thousand, two hundred seventy-two".