81144606 has 8 divisors (see below), whose sum is σ = 162289224. Its totient is φ = 27048200.

The previous prime is 81144601. The next prime is 81144619. The reversal of 81144606 is 60644118.

It is a sphenic number, since it is the product of 3 distinct primes.

81144606 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81144601) 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, 6762045 + ... + 6762056.

It is an arithmetic number, because the mean of its divisors is an integer number (20286153).

Almost surely, 2^81144606 is an apocalyptic number.

81144606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81144606 is a wasteful number, since it uses less digits than its factorization.

81144606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13524106.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 81144606 is about 9008.0300843192. The cubic root of 81144606 is about 432.9321969617.

It can be divided in two parts, 8114 and 4606, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 81144606 in words is "eighty-one million, one hundred forty-four thousand, six hundred six".