81675572 has 24 divisors (see below), whose sum is σ = 157906560. Its totient is φ = 36653760.

The previous prime is 81675563. The next prime is 81675589. The reversal of 81675572 is 27557618.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8273 + ... + 15224.

It is an arithmetic number, because the mean of its divisors is an integer number (6579440).

Almost surely, 2^81675572 is an apocalyptic number.

It is an amenable number.

81675572 is a deficient number, since it is larger than the sum of its proper divisors (76230988).

81675572 is a wasteful number, since it uses less digits than its factorization.

81675572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23591 (or 23589 counting only the distinct ones).

The product of its digits is 117600, while the sum is 41.

The square root of 81675572 is about 9037.4538449720. The cubic root of 81675572 is about 433.8744354202.

The spelling of 81675572 in words is "eighty-one million, six hundred seventy-five thousand, five hundred seventy-two".