68942309 has 4 divisors (see below), whose sum is σ = 71319660. Its totient is φ = 66564960.

The previous prime is 68942243. The next prime is 68942353. The reversal of 68942309 is 90324986.

It is a happy number.

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 36566209 + 32376100 = 6047^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 68942309 - 2²⁴ = 52165093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68942369) 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, 1188632 + ... + 1188689.

It is an arithmetic number, because the mean of its divisors is an integer number (17829915).

Almost surely, 2^68942309 is an apocalyptic number.

It is an amenable number.

68942309 is a deficient number, since it is larger than the sum of its proper divisors (2377351).

68942309 is a wasteful number, since it uses less digits than its factorization.

68942309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377350.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 68942309 is about 8303.1505466299. The cubic root of 68942309 is about 410.0422502563.

The spelling of 68942309 in words is "sixty-eight million, nine hundred forty-two thousand, three hundred nine".