81770304 has 112 divisors (see below), whose sum is σ = 269784576. Its totient is φ = 21235200.

The previous prime is 81770287. The next prime is 81770329. The reversal of 81770304 is 40307718.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

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, 12019 + ... + 17549.

Almost surely, 2^81770304 is an apocalyptic number.

81770304 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 81770304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134892288).

81770304 is an abundant number, since it is smaller than the sum of its proper divisors (188014272).

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

81770304 is a wasteful number, since it uses less digits than its factorization.

81770304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564 (or 5554 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 81770304 is about 9042.6934040694. The cubic root of 81770304 is about 434.0421147378.

The spelling of 81770304 in words is "eighty-one million, seven hundred seventy thousand, three hundred four".