81478469 has 8 divisors (see below), whose sum is σ = 83229120. Its totient is φ = 79740256.

The previous prime is 81478457. The next prime is 81478471. The reversal of 81478469 is 96487418.

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 81478469 - 2¹² = 81474373 is a prime.

It is a super-3 number, since 3×81478469³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81478409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10784 + ... + 16710.

It is an arithmetic number, because the mean of its divisors is an integer number (10403640).

Almost surely, 2^81478469 is an apocalyptic number.

It is an amenable number.

81478469 is a deficient number, since it is larger than the sum of its proper divisors (1750651).

81478469 is a wasteful number, since it uses less digits than its factorization.

81478469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219.

The product of its digits is 387072, while the sum is 47.

The square root of 81478469 is about 9026.5424720654. The cubic root of 81478469 is about 433.5251394802.

The spelling of 81478469 in words is "eighty-one million, four hundred seventy-eight thousand, four hundred sixty-nine".