81235776 has 28 divisors (see below), whose sum is σ = 214936832. Its totient is φ = 27078528.

The previous prime is 81235771. The next prime is 81235789. The reversal of 81235776 is 67753218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81235771) 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, 211360 + ... + 211743.

Almost surely, 2^81235776 is an apocalyptic number.

It is an amenable number.

81235776 is an abundant number, since it is smaller than the sum of its proper divisors (133701056).

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

81235776 is a wasteful number, since it uses less digits than its factorization.

81235776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423118 (or 423108 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 81235776 is about 9013.0891485661. The cubic root of 81235776 is about 433.0942765594.

The spelling of 81235776 in words is "eighty-one million, two hundred thirty-five thousand, seven hundred seventy-six".