81876516 has 12 divisors (see below), whose sum is σ = 191045232. Its totient is φ = 27292168.

The previous prime is 81876499. The next prime is 81876551. The reversal of 81876516 is 61567818.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411510 + ... + 3411533.

It is an arithmetic number, because the mean of its divisors is an integer number (15920436).

Almost surely, 2^81876516 is an apocalyptic number.

It is an amenable number.

81876516 is an abundant number, since it is smaller than the sum of its proper divisors (109168716).

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

81876516 is a wasteful number, since it uses less digits than its factorization.

81876516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6823050 (or 6823048 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 81876516 is about 9048.5643060101. The cubic root of 81876516 is about 434.2299601745.

The spelling of 81876516 in words is "eighty-one million, eight hundred seventy-six thousand, five hundred sixteen".