81625792 has 28 divisors (see below), whose sum is σ = 164729160. Its totient is φ = 40119296.

The previous prime is 81625787. The next prime is 81625799. The reversal of 81625792 is 29752618.

It is not an unprimeable number, because it can be changed into a prime (81625799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7033 + ... + 14584.

Almost surely, 2^81625792 is an apocalyptic number.

It is an amenable number.

81625792 is an abundant number, since it is smaller than the sum of its proper divisors (83103368).

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

81625792 is a wasteful number, since it uses less digits than its factorization.

81625792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21688 (or 21678 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 81625792 is about 9034.6993309130. The cubic root of 81625792 is about 433.7862709165.

The spelling of 81625792 in words is "eighty-one million, six hundred twenty-five thousand, seven hundred ninety-two".