81148624 has 10 divisors (see below), whose sum is σ = 157225490. Its totient is φ = 40574304.

The previous prime is 81148609. The next prime is 81148631. The reversal of 81148624 is 42684118.

It can be written as a sum of positive squares in only one way, i.e., 77792400 + 3356224 = 8820^2 + 1832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81148624.

It is a congruent number.

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, 2535879 + ... + 2535910.

It is an arithmetic number, because the mean of its divisors is an integer number (15722549).

Almost surely, 2^81148624 is an apocalyptic number.

It is an amenable number.

81148624 is a deficient number, since it is larger than the sum of its proper divisors (76076866).

81148624 is a wasteful number, since it uses less digits than its factorization.

81148624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071797 (or 5071791 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 81148624 is about 9008.2531047923. The cubic root of 81148624 is about 432.9393426117.

The spelling of 81148624 in words is "eighty-one million, one hundred forty-eight thousand, six hundred twenty-four".