81670098 has 16 divisors (see below), whose sum is σ = 163670976. Its totient is φ = 27168240.

The previous prime is 81670097. The next prime is 81670117. The reversal of 81670098 is 89007618.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81670097) 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, 10513 + ... + 16548.

It is an arithmetic number, because the mean of its divisors is an integer number (10229436).

Almost surely, 2^81670098 is an apocalyptic number.

81670098 is an abundant number, since it is smaller than the sum of its proper divisors (82000878).

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

81670098 is a wasteful number, since it uses less digits than its factorization.

81670098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27569.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 81670098 is about 9037.1509891116. The cubic root of 81670098 is about 433.8647422661.

The spelling of 81670098 in words is "eighty-one million, six hundred seventy thousand, ninety-eight".