81602016 has 24 divisors (see below), whose sum is σ = 214205544. Its totient is φ = 27200640.

The previous prime is 81601991. The next prime is 81602029. The reversal of 81602016 is 61020618.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 3 ways as a sum of consecutive naturals, for example, 424915 + ... + 425106.

It is an arithmetic number, because the mean of its divisors is an integer number (8925231).

Almost surely, 2^81602016 is an apocalyptic number.

It is an amenable number.

81602016 is an abundant number, since it is smaller than the sum of its proper divisors (132603528).

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

81602016 is a wasteful number, since it uses less digits than its factorization.

81602016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850034 (or 850026 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 81602016 is about 9033.3834192953. The cubic root of 81602016 is about 433.7441490018.

The spelling of 81602016 in words is "eighty-one million, six hundred two thousand, sixteen".