81210288 has 40 divisors (see below), whose sum is σ = 210700800. Its totient is φ = 26953024.

The previous prime is 81210281. The next prime is 81210289. The reversal of 81210288 is 88201218.

It is a super-2 number, since 2×81210288² = 13190221754085888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81210281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7933 + ... + 15011.

It is an arithmetic number, because the mean of its divisors is an integer number (5267520).

Almost surely, 2^81210288 is an apocalyptic number.

It is an amenable number.

81210288 is an abundant number, since it is smaller than the sum of its proper divisors (129490512).

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

81210288 is a wasteful number, since it uses less digits than its factorization.

81210288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7329 (or 7323 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 81210288 is about 9011.6750940100. The cubic root of 81210288 is about 433.0489768892.

The spelling of 81210288 in words is "eighty-one million, two hundred ten thousand, two hundred eighty-eight".