81727430 has 16 divisors (see below), whose sum is σ = 147585024. Its totient is φ = 32585280.

The previous prime is 81727411. The next prime is 81727433. The reversal of 81727430 is 3472718.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81727433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9926 + ... + 16185.

It is an arithmetic number, because the mean of its divisors is an integer number (9224064).

Almost surely, 2^81727430 is an apocalyptic number.

81727430 is a deficient number, since it is larger than the sum of its proper divisors (65857594).

81727430 is a wasteful number, since it uses less digits than its factorization.

81727430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26431.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 81727430 is about 9040.3224500014. The cubic root of 81727430 is about 433.9662421448.

The spelling of 81727430 in words is "eighty-one million, seven hundred twenty-seven thousand, four hundred thirty".