81479616 has 56 divisors (see below), whose sum is σ = 224966784. Its totient is φ = 25977600.

The previous prime is 81479579. The next prime is 81479617. The reversal of 81479616 is 61697418.

It is a super-3 number, since 3×81479616³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81479617) 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, 4810 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (4017264).

Almost surely, 2^81479616 is an apocalyptic number.

It is an amenable number.

81479616 is an abundant number, since it is smaller than the sum of its proper divisors (143487168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81479616 is a wasteful number, since it uses less digits than its factorization.

81479616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489 (or 18479 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 81479616 is about 9026.6060066893. The cubic root of 81479616 is about 433.5271737641.

The spelling of 81479616 in words is "eighty-one million, four hundred seventy-nine thousand, six hundred sixteen".