81147696 has 40 divisors (see below), whose sum is σ = 239579904. Its totient is φ = 23184960.

The previous prime is 81147679. The next prime is 81147707. The reversal of 81147696 is 69674118.

It is a super-2 number, since 2×81147696² = 13169897132216832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 120420 + ... + 121091.

Almost surely, 2^81147696 is an apocalyptic number.

It is an amenable number.

81147696 is an abundant number, since it is smaller than the sum of its proper divisors (158432208).

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

81147696 is a wasteful number, since it uses less digits than its factorization.

81147696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241529 (or 241523 counting only the distinct ones).

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

The square root of 81147696 is about 9008.2015963232. The cubic root of 81147696 is about 432.9376922685.

The spelling of 81147696 in words is "eighty-one million, one hundred forty-seven thousand, six hundred ninety-six".