81679452 has 12 divisors (see below), whose sum is σ = 190585416. Its totient is φ = 27226480.

The previous prime is 81679447. The next prime is 81679459. The reversal of 81679452 is 25497618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81679459) 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, 3403299 + ... + 3403322.

It is an arithmetic number, because the mean of its divisors is an integer number (15882118).

Almost surely, 2^81679452 is an apocalyptic number.

It is an amenable number.

81679452 is an abundant number, since it is smaller than the sum of its proper divisors (108905964).

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

81679452 is a wasteful number, since it uses less digits than its factorization.

81679452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6806628 (or 6806626 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 81679452 is about 9037.6685046532. The cubic root of 81679452 is about 433.8813057166.

The spelling of 81679452 in words is "eighty-one million, six hundred seventy-nine thousand, four hundred fifty-two".