81175416 has 64 divisors (see below), whose sum is σ = 235142400. Its totient is φ = 22871808.

The previous prime is 81175403. The next prime is 81175421. The reversal of 81175416 is 61457118.

It is a happy number.

It is a congruent number.

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, 8955 + ... + 15573.

It is an arithmetic number, because the mean of its divisors is an integer number (3674100).

Almost surely, 2^81175416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81175416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117571200).

81175416 is an abundant number, since it is smaller than the sum of its proper divisors (153966984).

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

81175416 is a wasteful number, since it uses less digits than its factorization.

81175416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6708 (or 6704 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 81175416 is about 9009.7400628431. The cubic root of 81175416 is about 432.9869837340.

The spelling of 81175416 in words is "eighty-one million, one hundred seventy-five thousand, four hundred sixteen".