81245616 has 40 divisors (see below), whose sum is σ = 211240944. Its totient is φ = 26906880.

The previous prime is 81245609. The next prime is 81245663. The reversal of 81245616 is 61654218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146 + ... + 12926.

Almost surely, 2^81245616 is an apocalyptic number.

It is an amenable number.

81245616 is an abundant number, since it is smaller than the sum of its proper divisors (129995328).

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

81245616 is a wasteful number, since it uses less digits than its factorization.

81245616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10949 (or 10943 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 81245616 is about 9013.6350048135. The cubic root of 81245616 is about 433.1117625975. Note that the first 3 decimals are identical.

The spelling of 81245616 in words is "eighty-one million, two hundred forty-five thousand, six hundred sixteen".