81752672 has 48 divisors (see below), whose sum is σ = 168975072. Its totient is φ = 38860800.

The previous prime is 81752651. The next prime is 81752683. The reversal of 81752672 is 27625718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203672 + ... + 204072.

It is an arithmetic number, because the mean of its divisors is an integer number (3520314).

Almost surely, 2^81752672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81752672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84487536).

81752672 is an abundant number, since it is smaller than the sum of its proper divisors (87222400).

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

81752672 is a wasteful number, since it uses less digits than its factorization.

81752672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 703 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 81752672 is about 9041.7184207428. The cubic root of 81752672 is about 434.0109152259.

The spelling of 81752672 in words is "eighty-one million, seven hundred fifty-two thousand, six hundred seventy-two".