81413598 has 24 divisors (see below), whose sum is σ = 189411912. Its totient is φ = 23260944.

The previous prime is 81413593. The next prime is 81413609. The reversal of 81413598 is 89531418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81413593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138165 + ... + 138752.

It is an arithmetic number, because the mean of its divisors is an integer number (7892163).

Almost surely, 2^81413598 is an apocalyptic number.

81413598 is an abundant number, since it is smaller than the sum of its proper divisors (107998314).

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

81413598 is a wasteful number, since it uses less digits than its factorization.

81413598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276936 (or 276929 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 81413598 is about 9022.9484094724. The cubic root of 81413598 is about 433.4100551861.

The spelling of 81413598 in words is "eighty-one million, four hundred thirteen thousand, five hundred ninety-eight".