81493528 has 16 divisors (see below), whose sum is σ = 153968760. Its totient is φ = 40435200.

The previous prime is 81493501. The next prime is 81493541. The reversal of 81493528 is 82539418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37833 + ... + 39928.

Almost surely, 2^81493528 is an apocalyptic number.

It is an amenable number.

81493528 is a deficient number, since it is larger than the sum of its proper divisors (72475232).

81493528 is a wasteful number, since it uses less digits than its factorization.

81493528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77898 (or 77894 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 81493528 is about 9027.3765845898. The cubic root of 81493528 is about 433.5518461387.

The spelling of 81493528 in words is "eighty-one million, four hundred ninety-three thousand, five hundred twenty-eight".