81457016 has 16 divisors (see below), whose sum is σ = 155982240. Its totient is φ = 39861760.

The previous prime is 81457003. The next prime is 81457039. The reversal of 81457016 is 61075418.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107945 + ... + 108696.

It is an arithmetic number, because the mean of its divisors is an integer number (9748890).

Almost surely, 2^81457016 is an apocalyptic number.

It is an amenable number.

81457016 is a deficient number, since it is larger than the sum of its proper divisors (74525224).

81457016 is a wasteful number, since it uses less digits than its factorization.

81457016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216694 (or 216690 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81457016 is about 9025.3540650769. The cubic root of 81457016 is about 433.4870875822.

The spelling of 81457016 in words is "eighty-one million, four hundred fifty-seven thousand, sixteen".