81755496 has 48 divisors (see below), whose sum is σ = 227412900. Its totient is φ = 26514432.

The previous prime is 81755483. The next prime is 81755503. The reversal of 81755496 is 69455718.

81755496 is a `hidden beast` number, since 8 + 1 + 7 + 554 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 57608100 + 24147396 = 7590^2 + 4914^2 .

It is a super-2 number, since 2×81755496² = 13367922252412032, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12681 + ... + 18008.

Almost surely, 2^81755496 is an apocalyptic number.

It is an amenable number.

81755496 is an abundant number, since it is smaller than the sum of its proper divisors (145657404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81755496 is a wasteful number, since it uses less digits than its factorization.

81755496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30738 (or 30731 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 81755496 is about 9041.8745843990. The cubic root of 81755496 is about 434.0159125456.

The spelling of 81755496 in words is "eighty-one million, seven hundred fifty-five thousand, four hundred ninety-six".