69840081 has 12 divisors (see below), whose sum is σ = 101051652. Its totient is φ = 46480896.

The previous prime is 69840047. The next prime is 69840083. The reversal of 69840081 is 18004896.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30902481 + 38937600 = 5559^2 + 6240^2 .

It is not a de Polignac number, because 69840081 - 2¹⁰ = 69839057 is a prime.

It is a super-2 number, since 2×69840081² = 9755273828173122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (69840083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 736 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (8420971).

Almost surely, 2^69840081 is an apocalyptic number.

It is an amenable number.

69840081 is a deficient number, since it is larger than the sum of its proper divisors (31211571).

69840081 is a wasteful number, since it uses less digits than its factorization.

69840081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200 (or 13197 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 69840081 is about 8357.0378125266. The cubic root of 69840081 is about 411.8144469534.

The spelling of 69840081 in words is "sixty-nine million, eight hundred forty thousand, eighty-one".