81680050 has 48 divisors (see below), whose sum is σ = 161418240. Its totient is φ = 30663360.

The previous prime is 81680041. The next prime is 81680057. The reversal of 81680050 is 5008618.

81680050 = T₄₅₅ + T₄₅₆ + ... + T₈₃₅.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81680057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120312 + ... + 120988.

It is an arithmetic number, because the mean of its divisors is an integer number (3362880).

Almost surely, 2^81680050 is an apocalyptic number.

81680050 is a deficient number, since it is larger than the sum of its proper divisors (79738190).

81680050 is a wasteful number, since it uses less digits than its factorization.

81680050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 81680050 is about 9037.7015883465. The cubic root of 81680050 is about 433.8823645728.

Adding to 81680050 its reverse (5008618), we get a palindrome (86688668).

The spelling of 81680050 in words is "eighty-one million, six hundred eighty thousand, fifty".