81522304 has 32 divisors (see below), whose sum is σ = 169475040. Its totient is φ = 38987520.

The previous prime is 81522263. The next prime is 81522313. The reversal of 81522304 is 40322518.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10902 + ... + 16789.

It is an arithmetic number, because the mean of its divisors is an integer number (5296095).

Almost surely, 2^81522304 is an apocalyptic number.

It is an amenable number.

81522304 is an abundant number, since it is smaller than the sum of its proper divisors (87952736).

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

81522304 is a wasteful number, since it uses less digits than its factorization.

81522304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27728 (or 27716 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 81522304 is about 9028.9702624386. The cubic root of 81522304 is about 433.6028703123.

The spelling of 81522304 in words is "eighty-one million, five hundred twenty-two thousand, three hundred four".