81602136 has 192 divisors, whose sum is σ = 283046400. Its totient is φ = 20620800.

The previous prime is 81602117. The next prime is 81602153. The reversal of 81602136 is 63120618.

It is a congruent number.

It is an unprimeable number.

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, 227125 + ... + 227483.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^81602136 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 81602136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141523200).

81602136 is an abundant number, since it is smaller than the sum of its proper divisors (201444264).

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

81602136 is a wasteful number, since it uses less digits than its factorization.

81602136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81602136 is about 9033.3900613225. The cubic root of 81602136 is about 433.7443616162.

It can be divided in two parts, 8160 and 2136, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 81602136 in words is "eighty-one million, six hundred two thousand, one hundred thirty-six".