81625968 has 50 divisors (see below), whose sum is σ = 236252984. Its totient is φ = 27208224.

The previous prime is 81625967. The next prime is 81626003. The reversal of 81625968 is 86952618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81625961) 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 9 ways as a sum of consecutive naturals, for example, 30196 + ... + 32787.

Almost surely, 2^81625968 is an apocalyptic number.

It is an amenable number.

81625968 is an abundant number, since it is smaller than the sum of its proper divisors (154627016).

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

81625968 is a wasteful number, since it uses less digits than its factorization.

81625968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63003 (or 62988 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 81625968 is about 9034.7090711323. The cubic root of 81625968 is about 433.7865826902.

The spelling of 81625968 in words is "eighty-one million, six hundred twenty-five thousand, nine hundred sixty-eight".