81723752 has 16 divisors (see below), whose sum is σ = 167162400. Its totient is φ = 37147120.

The previous prime is 81723749. The next prime is 81723757. The reversal of 81723752 is 25732718.

It is not an unprimeable number, because it can be changed into a prime (81723757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464252 + ... + 464427.

It is an arithmetic number, because the mean of its divisors is an integer number (10447650).

Almost surely, 2^81723752 is an apocalyptic number.

It is an amenable number.

81723752 is an abundant number, since it is smaller than the sum of its proper divisors (85438648).

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

81723752 is a wasteful number, since it uses less digits than its factorization.

81723752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928696 (or 928692 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 81723752 is about 9040.1190257651. The cubic root of 81723752 is about 433.9597320833.

The spelling of 81723752 in words is "eighty-one million, seven hundred twenty-three thousand, seven hundred fifty-two".