81147468 has 24 divisors (see below), whose sum is σ = 189969472. Its totient is φ = 26959824.

The previous prime is 81147449. The next prime is 81147497. The reversal of 81147468 is 86474118.

It is a super-2 number, since 2×81147468² = 13169823125622048, which contains 22 as substring.

It is an unprimeable number.

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, 7330 + ... + 14697.

Almost surely, 2^81147468 is an apocalyptic number.

It is an amenable number.

81147468 is an abundant number, since it is smaller than the sum of its proper divisors (108822004).

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

81147468 is a wasteful number, since it uses less digits than its factorization.

81147468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22341 (or 22339 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 81147468 is about 9008.1889411801. The cubic root of 81147468 is about 432.9372867943.

The spelling of 81147468 in words is "eighty-one million, one hundred forty-seven thousand, four hundred sixty-eight".