81598338 has 12 divisors (see below), whose sum is σ = 176796438. Its totient is φ = 27199440.

The previous prime is 81598337. The next prime is 81598339. The reversal of 81598338 is 83389518.

It is an interprime number because it is at equal distance from previous prime (81598337) and next prime (81598339).

It can be written as a sum of positive squares in only one way, i.e., 81595089 + 3249 = 9033^2 + 57^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81598293 and 81598302.

It is not an unprimeable number, because it can be changed into a prime (81598333) 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 5 ways as a sum of consecutive naturals, for example, 2266603 + ... + 2266638.

Almost surely, 2^81598338 is an apocalyptic number.

81598338 is an abundant number, since it is smaller than the sum of its proper divisors (95198100).

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

81598338 is a wasteful number, since it uses less digits than its factorization.

81598338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4533249 (or 4533246 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 81598338 is about 9033.1798387943. The cubic root of 81598338 is about 433.7376322717.

The spelling of 81598338 in words is "eighty-one million, five hundred ninety-eight thousand, three hundred thirty-eight".