81577416 has 16 divisors (see below), whose sum is σ = 203943600. Its totient is φ = 27192464.

The previous prime is 81577411. The next prime is 81577417. The reversal of 81577416 is 61477518.

It is not an unprimeable number, because it can be changed into a prime (81577411) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1699506 + ... + 1699553.

It is an arithmetic number, because the mean of its divisors is an integer number (12746475).

Almost surely, 2^81577416 is an apocalyptic number.

It is an amenable number.

81577416 is an abundant number, since it is smaller than the sum of its proper divisors (122366184).

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

81577416 is a wasteful number, since it uses less digits than its factorization.

81577416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399068 (or 3399064 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 81577416 is about 9032.0217005939. The cubic root of 81577416 is about 433.7005586635.

The spelling of 81577416 in words is "eighty-one million, five hundred seventy-seven thousand, four hundred sixteen".