81354679 has 8 divisors (see below), whose sum is σ = 93033248. Its totient is φ = 69690240.

The previous prime is 81354659. The next prime is 81354719. The reversal of 81354679 is 97645318.

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 81354679 - 2⁹ = 81354167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81354649) 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, 16099 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (11629156).

Almost surely, 2^81354679 is an apocalyptic number.

81354679 is a deficient number, since it is larger than the sum of its proper divisors (11678569).

81354679 is a wasteful number, since it uses less digits than its factorization.

81354679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065.

The product of its digits is 181440, while the sum is 43.

The square root of 81354679 is about 9019.6828658218. The cubic root of 81354679 is about 433.3054770390.

The spelling of 81354679 in words is "eighty-one million, three hundred fifty-four thousand, six hundred seventy-nine".