81202176 has 220 divisors, whose sum is σ = 267501960. Its totient is φ = 24330240.

The previous prime is 81202171. The next prime is 81202243. The reversal of 81202176 is 67120218.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81202171) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 912340 + ... + 912428.

It is an arithmetic number, because the mean of its divisors is an integer number (1215918).

Almost surely, 2^81202176 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 81202176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133750980).

81202176 is an abundant number, since it is smaller than the sum of its proper divisors (186299784).

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

81202176 is a wasteful number, since it uses less digits than its factorization.

81202176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81202176 is about 9011.2249999653. The cubic root of 81202176 is about 433.0345574917.

It can be divided in two parts, 8120 and 2176, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 81202176 in words is "eighty-one million, two hundred two thousand, one hundred seventy-six".