81453672 has 96 divisors (see below), whose sum is σ = 232951680. Its totient is φ = 25660800.

The previous prime is 81453667. The next prime is 81453719. The reversal of 81453672 is 27635418.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 167013 + ... + 167499.

It is an arithmetic number, because the mean of its divisors is an integer number (2426580).

Almost surely, 2^81453672 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 81453672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116475840).

81453672 is an abundant number, since it is smaller than the sum of its proper divisors (151498008).

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

81453672 is a wasteful number, since it uses less digits than its factorization.

81453672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 616 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81453672 is about 9025.1688072855. The cubic root of 81453672 is about 433.4811556165.

The spelling of 81453672 in words is "eighty-one million, four hundred fifty-three thousand, six hundred seventy-two".