81269358 has 8 divisors (see below), whose sum is σ = 162538728. Its totient is φ = 27089784.

The previous prime is 81269351. The next prime is 81269407. The reversal of 81269358 is 85396218.

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

81269358 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81269351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6772441 + ... + 6772452.

It is an arithmetic number, because the mean of its divisors is an integer number (20317341).

Almost surely, 2^81269358 is an apocalyptic number.

81269358 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.

81269358 is a wasteful number, since it uses less digits than its factorization.

81269358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13544898.

The product of its digits is 103680, while the sum is 42.

The square root of 81269358 is about 9014.9519133493. The cubic root of 81269358 is about 433.1539471834.

The spelling of 81269358 in words is "eighty-one million, two hundred sixty-nine thousand, three hundred fifty-eight".