81667068 has 24 divisors (see below), whose sum is σ = 217779072. Its totient is φ = 23333424.

The previous prime is 81667067. The next prime is 81667093. The reversal of 81667068 is 86076618.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81667067) 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, 486030 + ... + 486197.

It is an arithmetic number, because the mean of its divisors is an integer number (9074128).

Almost surely, 2^81667068 is an apocalyptic number.

It is an amenable number.

81667068 is an abundant number, since it is smaller than the sum of its proper divisors (136112004).

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

81667068 is a wasteful number, since it uses less digits than its factorization.

81667068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972241 (or 972239 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 81667068 is about 9036.9833462279. The cubic root of 81667068 is about 433.8593766694.

The spelling of 81667068 in words is "eighty-one million, six hundred sixty-seven thousand, sixty-eight".