81838577 has 8 divisors (see below), whose sum is σ = 85518720. Its totient is φ = 78168640.

The previous prime is 81838573. The next prime is 81838591. The reversal of 81838577 is 77583818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81838577 - 2² = 81838573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81838573) 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, 17177 + ... + 21417.

It is an arithmetic number, because the mean of its divisors is an integer number (10689840).

Almost surely, 2^81838577 is an apocalyptic number.

It is an amenable number.

81838577 is a deficient number, since it is larger than the sum of its proper divisors (3680143).

81838577 is a wasteful number, since it uses less digits than its factorization.

81838577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103.

The product of its digits is 376320, while the sum is 47.

The square root of 81838577 is about 9046.4676531782. The cubic root of 81838577 is about 434.1628803146.

The spelling of 81838577 in words is "eighty-one million, eight hundred thirty-eight thousand, five hundred seventy-seven".