68405669 has 4 divisors (see below), whose sum is σ = 69696396. Its totient is φ = 67114944.

The previous prime is 68405641. The next prime is 68405677. The reversal of 68405669 is 96650486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48469444 + 19936225 = 6962^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 68405669 - 2⁸ = 68405413 is a prime.

It is a super-2 number, since 2×68405669² = 9358671102675122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68405609) 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, 645284 + ... + 645389.

It is an arithmetic number, because the mean of its divisors is an integer number (17424099).

Almost surely, 2^68405669 is an apocalyptic number.

It is an amenable number.

68405669 is a deficient number, since it is larger than the sum of its proper divisors (1290727).

68405669 is a wasteful number, since it uses less digits than its factorization.

68405669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290726.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 68405669 is about 8270.7719712249. The cubic root of 68405669 is about 408.9755685894.

The spelling of 68405669 in words is "sixty-eight million, four hundred five thousand, six hundred sixty-nine".