81222887 has 8 divisors (see below), whose sum is σ = 83023920. Its totient is φ = 79441600.

The previous prime is 81222877. The next prime is 81222893. The reversal of 81222887 is 78822218.

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 81222887 - 2¹⁰ = 81221863 is a prime.

It is a super-2 number, since 2×81222887² = 13194314745229538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81222887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81222877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3539 + ... + 13227.

It is an arithmetic number, because the mean of its divisors is an integer number (10377990).

Almost surely, 2^81222887 is an apocalyptic number.

81222887 is a deficient number, since it is larger than the sum of its proper divisors (1801033).

81222887 is a wasteful number, since it uses less digits than its factorization.

81222887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9873.

The product of its digits is 28672, while the sum is 38.

The square root of 81222887 is about 9012.3741045298. The cubic root of 81222887 is about 433.0713702011.

The spelling of 81222887 in words is "eighty-one million, two hundred twenty-two thousand, eight hundred eighty-seven".