81627198 has 8 divisors (see below), whose sum is σ = 163254408. Its totient is φ = 27209064.

The previous prime is 81627181. The next prime is 81627241. The reversal of 81627198 is 89172618.

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

81627198 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6802261 + ... + 6802272.

It is an arithmetic number, because the mean of its divisors is an integer number (20406801).

Almost surely, 2^81627198 is an apocalyptic number.

81627198 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81627198 is a wasteful number, since it uses less digits than its factorization.

81627198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13604538.

The product of its digits is 48384, while the sum is 42.

The square root of 81627198 is about 9034.7771416898. Note that the first 3 decimals coincide. The cubic root of 81627198 is about 433.7887615508.

The spelling of 81627198 in words is "eighty-one million, six hundred twenty-seven thousand, one hundred ninety-eight".