81768867 has 8 divisors (see below), whose sum is σ = 110873280. Its totient is φ = 53588520.

The previous prime is 81768847. The next prime is 81768923. The reversal of 81768867 is 76886718.

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

It is not a de Polignac number, because 81768867 - 2⁶ = 81768803 is a prime.

It is a super-2 number, since 2×81768867² = 13372295220927378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81768847) 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, 230809 + ... + 231162.

It is an arithmetic number, because the mean of its divisors is an integer number (13859160).

Almost surely, 2^81768867 is an apocalyptic number.

81768867 is a deficient number, since it is larger than the sum of its proper divisors (29104413).

81768867 is a wasteful number, since it uses less digits than its factorization.

81768867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462033.

The product of its digits is 903168, while the sum is 51.

The square root of 81768867 is about 9042.6139473053. The cubic root of 81768867 is about 434.0395721596.

The spelling of 81768867 in words is "eighty-one million, seven hundred sixty-eight thousand, eight hundred sixty-seven".