81472285 has 12 divisors (see below), whose sum is σ = 103185468. Its totient is φ = 61746048.

The previous prime is 81472283. The next prime is 81472301. The reversal of 81472285 is 58227418.

It can be written as a sum of positive squares in 2 ways, for example, as 19598329 + 61873956 = 4427^2 + 7866^2 .

It is not a de Polignac number, because 81472285 - 2¹ = 81472283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81472283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20764 + ... + 24373.

It is an arithmetic number, because the mean of its divisors is an integer number (8598789).

Almost surely, 2^81472285 is an apocalyptic number.

It is an amenable number.

81472285 is a deficient number, since it is larger than the sum of its proper divisors (21713183).

81472285 is a wasteful number, since it uses less digits than its factorization.

81472285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45180 (or 45161 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 81472285 is about 9026.1999202322. The cubic root of 81472285 is about 433.5141713995.

The spelling of 81472285 in words is "eighty-one million, four hundred seventy-two thousand, two hundred eighty-five".