81493068 has 24 divisors (see below), whose sum is σ = 190297072. Its totient is φ = 27143424.

The previous prime is 81493067. The next prime is 81493081. The reversal of 81493068 is 86039418.

It is a super-2 number, since 2×81493068² = 13282240264105248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81493067) 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, 27096 + ... + 29952.

Almost surely, 2^81493068 is an apocalyptic number.

It is an amenable number.

81493068 is an abundant number, since it is smaller than the sum of its proper divisors (108804004).

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

81493068 is a wasteful number, since it uses less digits than its factorization.

81493068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241 (or 5239 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81493068 is about 9027.3511064985. The cubic root of 81493068 is about 433.5510303920.

The spelling of 81493068 in words is "eighty-one million, four hundred ninety-three thousand, sixty-eight".