81352908 has 144 divisors (see below), whose sum is σ = 266622720. Its totient is φ = 20310912.

The previous prime is 81352907. The next prime is 81352919. The reversal of 81352908 is 80925318.

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

It is not an unprimeable number, because it can be changed into a prime (81352903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61591 + ... + 62897.

Almost surely, 2^81352908 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 81352908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133311360).

81352908 is an abundant number, since it is smaller than the sum of its proper divisors (185269812).

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

81352908 is a wasteful number, since it uses less digits than its factorization.

81352908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 81352908 is about 9019.5846911041. The cubic root of 81352908 is about 433.3023328250.

The spelling of 81352908 in words is "eighty-one million, three hundred fifty-two thousand, nine hundred eight".