81525628 has 12 divisors (see below), whose sum is σ = 142734312. Its totient is φ = 40744400.

The previous prime is 81525617. The next prime is 81525649. The reversal of 81525628 is 82652518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12051 + ... + 17557.

It is an arithmetic number, because the mean of its divisors is an integer number (11894526).

Almost surely, 2^81525628 is an apocalyptic number.

It is an amenable number.

81525628 is a deficient number, since it is larger than the sum of its proper divisors (61208684).

81525628 is a wasteful number, since it uses less digits than its factorization.

81525628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9212 (or 9210 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 81525628 is about 9029.1543347093. The cubic root of 81525628 is about 433.6087634903.

The spelling of 81525628 in words is "eighty-one million, five hundred twenty-five thousand, six hundred twenty-eight".