81214304 has 48 divisors (see below), whose sum is σ = 170181648. Its totient is φ = 38019072.

The previous prime is 81214283. The next prime is 81214307. The reversal of 81214304 is 40341218.

It is a self number, because there is not a number n which added to its sum of digits gives 81214304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183107 + ... + 183549.

It is an arithmetic number, because the mean of its divisors is an integer number (3545451).

Almost surely, 2^81214304 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 81214304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85090824).

81214304 is an abundant number, since it is smaller than the sum of its proper divisors (88967344).

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

81214304 is a wasteful number, since it uses less digits than its factorization.

81214304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81214304 is about 9011.8979133144. The cubic root of 81214304 is about 433.0561151310.

It can be divided in two parts, 81214 and 304, that added together give a palindrome (81518).

The spelling of 81214304 in words is "eighty-one million, two hundred fourteen thousand, three hundred four".