68309777 has 4 divisors (see below), whose sum is σ = 68426736. Its totient is φ = 68192820.

The previous prime is 68309767. The next prime is 68309809. The reversal of 68309777 is 77790386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77790386 = 2 ⋅38895193.

It is a cyclic number.

It is not a de Polignac number, because 68309777 - 2⁶ = 68309713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68309767) 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, 57599 + ... + 58772.

It is an arithmetic number, because the mean of its divisors is an integer number (17106684).

Almost surely, 2^68309777 is an apocalyptic number.

It is an amenable number.

68309777 is a deficient number, since it is larger than the sum of its proper divisors (116959).

68309777 is a wasteful number, since it uses less digits than its factorization.

68309777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116958.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 68309777 is about 8264.9728977172. The cubic root of 68309777 is about 408.7843767127.

The spelling of 68309777 in words is "sixty-eight million, three hundred nine thousand, seven hundred seventy-seven".