81077224 has 8 divisors (see below), whose sum is σ = 152019810. Its totient is φ = 40538608.

The previous prime is 81077207. The next prime is 81077251. The reversal of 81077224 is 42277018.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 35784324 = 6730^2 + 5982^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5067319 + ... + 5067334.

Almost surely, 2^81077224 is an apocalyptic number.

It is an amenable number.

81077224 is a deficient number, since it is larger than the sum of its proper divisors (70942586).

81077224 is a wasteful number, since it uses less digits than its factorization.

81077224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134659 (or 10134655 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 81077224 is about 9004.2892001534. The cubic root of 81077224 is about 432.8123289994.

The spelling of 81077224 in words is "eighty-one million, seventy-seven thousand, two hundred twenty-four".