81305098 has 8 divisors (see below), whose sum is σ = 139380192. Its totient is φ = 34845036.

The previous prime is 81305089. The next prime is 81305099. The reversal of 81305098 is 89050318.

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

It is a super-2 number, since 2×81305098² = 13221037921579208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81305099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2903740 + ... + 2903767.

It is an arithmetic number, because the mean of its divisors is an integer number (17422524).

Almost surely, 2^81305098 is an apocalyptic number.

81305098 is a deficient number, since it is larger than the sum of its proper divisors (58075094).

81305098 is a wasteful number, since it uses less digits than its factorization.

81305098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807516.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81305098 is about 9016.9339578373. The cubic root of 81305098 is about 433.2174342247.

The spelling of 81305098 in words is "eighty-one million, three hundred five thousand, ninety-eight".