81352288 has 24 divisors (see below), whose sum is σ = 167127408. Its totient is φ = 38907264.

The previous prime is 81352261. The next prime is 81352289. The reversal of 81352288 is 88225318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81352289) 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, 54531 + ... + 56002.

It is an arithmetic number, because the mean of its divisors is an integer number (6963642).

Almost surely, 2^81352288 is an apocalyptic number.

It is an amenable number.

81352288 is an abundant number, since it is smaller than the sum of its proper divisors (85775120).

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

81352288 is a wasteful number, since it uses less digits than its factorization.

81352288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110566 (or 110558 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 81352288 is about 9019.5503213852. The cubic root of 81352288 is about 433.3012320730.

The spelling of 81352288 in words is "eighty-one million, three hundred fifty-two thousand, two hundred eighty-eight".