81425608 has 16 divisors (see below), whose sum is σ = 166552560. Its totient is φ = 37011600.

The previous prime is 81425599. The next prime is 81425611. The reversal of 81425608 is 80652418.

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 in 3 ways as a sum of consecutive naturals, for example, 462558 + ... + 462733.

It is an arithmetic number, because the mean of its divisors is an integer number (10409535).

Almost surely, 2^81425608 is an apocalyptic number.

81425608 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81425608 is an abundant number, since it is smaller than the sum of its proper divisors (85126952).

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

81425608 is a wasteful number, since it uses less digits than its factorization.

81425608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925308 (or 925304 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81425608 is about 9023.6139101803. The cubic root of 81425608 is about 433.4313661176.

The spelling of 81425608 in words is "eighty-one million, four hundred twenty-five thousand, six hundred eight".