81145896 has 64 divisors (see below), whose sum is σ = 231336000. Its totient is φ = 23497728.

The previous prime is 81145873. The next prime is 81145907. The reversal of 81145896 is 69854118.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2346 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (3614625).

Almost surely, 2^81145896 is an apocalyptic number.

It is an amenable number.

81145896 is an abundant number, since it is smaller than the sum of its proper divisors (150190104).

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

81145896 is a wasteful number, since it uses less digits than its factorization.

81145896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15338 (or 15334 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 81145896 is about 9008.1016868150. The cubic root of 81145896 is about 432.9344911359.

The spelling of 81145896 in words is "eighty-one million, one hundred forty-five thousand, eight hundred ninety-six".