81726288 has 40 divisors (see below), whose sum is σ = 241288128. Its totient is φ = 23350272.

The previous prime is 81726287. The next prime is 81726313. The reversal of 81726288 is 88262718.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81726287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121281 + ... + 121952.

Almost surely, 2^81726288 is an apocalyptic number.

It is an amenable number.

81726288 is an abundant number, since it is smaller than the sum of its proper divisors (159561840).

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

81726288 is a wasteful number, since it uses less digits than its factorization.

81726288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243251 (or 243245 counting only the distinct ones).

The product of its digits is 86016, while the sum is 42.

The square root of 81726288 is about 9040.2592883169. The cubic root of 81726288 is about 433.9642208253.

The spelling of 81726288 in words is "eighty-one million, seven hundred twenty-six thousand, two hundred eighty-eight".