81671602 has 16 divisors (see below), whose sum is σ = 124133472. Its totient is φ = 40296960.

The previous prime is 81671599. The next prime is 81671657. The reversal of 81671602 is 20617618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70258 + ... + 71410.

It is an arithmetic number, because the mean of its divisors is an integer number (7758342).

Almost surely, 2^81671602 is an apocalyptic number.

81671602 is a deficient number, since it is larger than the sum of its proper divisors (42461870).

81671602 is a wasteful number, since it uses less digits than its factorization.

81671602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81671602 is about 9037.2342007940. The cubic root of 81671602 is about 433.8674055361.

The spelling of 81671602 in words is "eighty-one million, six hundred seventy-one thousand, six hundred two".