81064269 has 24 divisors (see below), whose sum is σ = 137565792. Its totient is φ = 45349920.

The previous prime is 81064253. The next prime is 81064283. The reversal of 81064269 is 96246018.

81064269 is a `hidden beast` number, since 8 + 1 + 0 + 642 + 6 + 9 = 666.

It is not a de Polignac number, because 81064269 - 2⁴ = 81064253 is a prime.

It is a super-3 number, since 3×81064269³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30207 + ... + 32780.

It is an arithmetic number, because the mean of its divisors is an integer number (5731908).

Almost surely, 2^81064269 is an apocalyptic number.

It is an amenable number.

81064269 is a deficient number, since it is larger than the sum of its proper divisors (56501523).

81064269 is a wasteful number, since it uses less digits than its factorization.

81064269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63017 (or 63014 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 81064269 is about 9003.5697920325. The cubic root of 81064269 is about 432.7892753307.

The spelling of 81064269 in words is "eighty-one million, sixty-four thousand, two hundred sixty-nine".