81562672 has 20 divisors (see below), whose sum is σ = 161391456. Its totient is φ = 39913280.

The previous prime is 81562667. The next prime is 81562709. The reversal of 81562672 is 27626518.

It is a happy number.

It is an unprimeable number.

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, 53479 + ... + 54982.

Almost surely, 2^81562672 is an apocalyptic number.

It is an amenable number.

81562672 is a deficient number, since it is larger than the sum of its proper divisors (79828784).

81562672 is a wasteful number, since it uses less digits than its factorization.

81562672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108516 (or 108510 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 81562672 is about 9031.2054566376. The cubic root of 81562672 is about 433.6744286117.

The spelling of 81562672 in words is "eighty-one million, five hundred sixty-two thousand, six hundred seventy-two".