68309764 has 6 divisors (see below), whose sum is σ = 119542094. Its totient is φ = 34154880.

The previous prime is 68309749. The next prime is 68309767. The reversal of 68309764 is 46790386.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 412164 = 8240^2 + 642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68309764.

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 as a sum of consecutive naturals, namely, 8538717 + ... + 8538724.

Almost surely, 2^68309764 is an apocalyptic number.

It is an amenable number.

68309764 is a deficient number, since it is larger than the sum of its proper divisors (51232330).

68309764 is a wasteful number, since it uses less digits than its factorization.

68309764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17077445 (or 17077443 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 68309764 is about 8264.9721112657. The cubic root of 68309764 is about 408.7843507808.

The spelling of 68309764 in words is "sixty-eight million, three hundred nine thousand, seven hundred sixty-four".