81208423 has 8 divisors (see below), whose sum is σ = 84837888. Its totient is φ = 77587224.

The previous prime is 81208411. The next prime is 81208429. The reversal of 81208423 is 32480218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81208423 is a prime.

It is a super-2 number, since 2×81208423² = 13189615932293858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81208391 and 81208400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81208429) 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, 26686 + ... + 29572.

It is an arithmetic number, because the mean of its divisors is an integer number (10604736).

Almost surely, 2^81208423 is an apocalyptic number.

81208423 is a deficient number, since it is larger than the sum of its proper divisors (3629465).

81208423 is a wasteful number, since it uses less digits than its factorization.

81208423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4133.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 81208423 is about 9011.5716165384. The cubic root of 81208423 is about 433.0456618637.

The spelling of 81208423 in words is "eighty-one million, two hundred eight thousand, four hundred twenty-three".