81144064 has 27 divisors (see below), whose sum is σ = 162259363. Its totient is φ = 40499968.

The previous prime is 81144061. The next prime is 81144083. The reversal of 81144064 is 46044118.

The square root of 81144064 is 9008.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81144061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 143847 + ... + 144409.

Almost surely, 2^81144064 is an apocalyptic number.

81144064 is the 9008-th square number.

It is an amenable number.

81144064 is a deficient number, since it is larger than the sum of its proper divisors (81115299).

81144064 is an frugal number, since it uses more digits than its factorization.

81144064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The cubic root of 81144064 is about 432.9312330457.

The spelling of 81144064 in words is "eighty-one million, one hundred forty-four thousand, sixty-four".