81236288 has 56 divisors (see below), whose sum is σ = 188561472. Its totient is φ = 33997824.

The previous prime is 81236273. The next prime is 81236303. The reversal of 81236288 is 88263218.

It is an interprime number because it is at equal distance from previous prime (81236273) and next prime (81236303).

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17156 + ... + 21372.

Almost surely, 2^81236288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81236288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94280736).

81236288 is an abundant number, since it is smaller than the sum of its proper divisors (107325184).

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

81236288 is a wasteful number, since it uses less digits than its factorization.

81236288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279 (or 4269 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 81236288 is about 9013.1175516577. The cubic root of 81236288 is about 433.0951864369.

The spelling of 81236288 in words is "eighty-one million, two hundred thirty-six thousand, two hundred eighty-eight".