81350304 has 96 divisors (see below), whose sum is σ = 258443136. Its totient is φ = 21872640.

The previous prime is 81350303. The next prime is 81350323. The reversal of 81350304 is 40305318.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (81350303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7864 + ... + 14984.

It is an arithmetic number, because the mean of its divisors is an integer number (2692116).

Almost surely, 2^81350304 is an apocalyptic number.

81350304 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81350304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129221568).

81350304 is an abundant number, since it is smaller than the sum of its proper divisors (177092832).

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

81350304 is a wasteful number, since it uses less digits than its factorization.

81350304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158 (or 7150 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 81350304 is about 9019.4403374045. The cubic root of 81350304 is about 433.2977096290.

The spelling of 81350304 in words is "eighty-one million, three hundred fifty thousand, three hundred four".