81472824 has 64 divisors (see below), whose sum is σ = 227174400. Its totient is φ = 27054432.

The previous prime is 81472801. The next prime is 81472841. The reversal of 81472824 is 42827418.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74409 + ... + 75495.

It is an arithmetic number, because the mean of its divisors is an integer number (3549600).

Almost surely, 2^81472824 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 81472824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113587200).

81472824 is an abundant number, since it is smaller than the sum of its proper divisors (145701576).

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

81472824 is a wasteful number, since it uses less digits than its factorization.

81472824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449 (or 1439 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 81472824 is about 9026.2297777090. The cubic root of 81472824 is about 433.5151274040.

The spelling of 81472824 in words is "eighty-one million, four hundred seventy-two thousand, eight hundred twenty-four".