81368598 has 8 divisors (see below), whose sum is σ = 162737208. Its totient is φ = 27122864.

The previous prime is 81368593. The next prime is 81368653. The reversal of 81368598 is 89586318.

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

81368598 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81368591) 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, 6780711 + ... + 6780722.

It is an arithmetic number, because the mean of its divisors is an integer number (20342151).

Almost surely, 2^81368598 is an apocalyptic number.

81368598 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81368598 is a wasteful number, since it uses less digits than its factorization.

81368598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561438.

The product of its digits is 414720, while the sum is 48.

The square root of 81368598 is about 9020.4544231430. The cubic root of 81368598 is about 433.3301870909.

The spelling of 81368598 in words is "eighty-one million, three hundred sixty-eight thousand, five hundred ninety-eight".