81148744 has 16 divisors (see below), whose sum is σ = 152250300. Its totient is φ = 40548672.

The previous prime is 81148741. The next prime is 81148787. The reversal of 81148744 is 44784118.

It can be written as a sum of positive squares in 2 ways, for example, as 76352644 + 4796100 = 8738^2 + 2190^2 .

It is not an unprimeable number, because it can be changed into a prime (81148741) 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 3 ways as a sum of consecutive naturals, for example, 20494 + ... + 24130.

Almost surely, 2^81148744 is an apocalyptic number.

It is an amenable number.

81148744 is a deficient number, since it is larger than the sum of its proper divisors (71101556).

81148744 is a wasteful number, since it uses less digits than its factorization.

81148744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432 (or 6428 counting only the distinct ones).

The product of its digits is 28672, while the sum is 37.

The square root of 81148744 is about 9008.2597653487. The cubic root of 81148744 is about 432.9395560173.

The spelling of 81148744 in words is "eighty-one million, one hundred forty-eight thousand, seven hundred forty-four".