81288230 has 16 divisors (see below), whose sum is σ = 146463984. Its totient is φ = 32483040.

The previous prime is 81288227. The next prime is 81288257. The reversal of 81288230 is 3288218.

It is a super-3 number, since 3×81288230³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8369 + ... + 15251.

It is an arithmetic number, because the mean of its divisors is an integer number (9153999).

Almost surely, 2^81288230 is an apocalyptic number.

81288230 is a deficient number, since it is larger than the sum of its proper divisors (65175754).

81288230 is a wasteful number, since it uses less digits than its factorization.

81288230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 81288230 is about 9015.9985581188. The cubic root of 81288230 is about 433.1874729337.

It can be divided in two parts, 81288 and 230, that added together give a palindrome (81518).

The spelling of 81288230 in words is "eighty-one million, two hundred eighty-eight thousand, two hundred thirty".