81876215 has 8 divisors (see below), whose sum is σ = 98431200. Its totient is φ = 65381152.

The previous prime is 81876203. The next prime is 81876217. The reversal of 81876215 is 51267818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81876215 - 2²² = 77681911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81876217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11915 + ... + 17484.

It is an arithmetic number, because the mean of its divisors is an integer number (12303900).

Almost surely, 2^81876215 is an apocalyptic number.

81876215 is a deficient number, since it is larger than the sum of its proper divisors (16554985).

81876215 is a wasteful number, since it uses less digits than its factorization.

81876215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29961.

The product of its digits is 26880, while the sum is 38.

The square root of 81876215 is about 9048.5476735220. The cubic root of 81876215 is about 434.2294280586.

The spelling of 81876215 in words is "eighty-one million, eight hundred seventy-six thousand, two hundred fifteen".