81142308 has 54 divisors (see below), whose sum is σ = 222117714. Its totient is φ = 24964992.

The previous prime is 81142307. The next prime is 81142349. The reversal of 81142308 is 80324118.

It can be written as a sum of positive squares in 3 ways, for example, as 1004004 + 80138304 = 1002^2 + 8952^2 .

It is not an unprimeable number, because it can be changed into a prime (81142301) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 585 + ... + 12752.

It is an arithmetic number, because the mean of its divisors is an integer number (4113291).

Almost surely, 2^81142308 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 81142308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111058857).

81142308 is an abundant number, since it is smaller than the sum of its proper divisors (140975406).

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

81142308 is a wasteful number, since it uses less digits than its factorization.

81142308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13373 (or 13355 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81142308 is about 9007.9025305562. The cubic root of 81142308 is about 432.9281100703.

It can be divided in two parts, 8 and 1142308, that added together give a triangular number (1142316 = T₁₅₁₁).

The spelling of 81142308 in words is "eighty-one million, one hundred forty-two thousand, three hundred eight".