68309761 has 8 divisors (see below), whose sum is σ = 76101480. Its totient is φ = 60880512.

The previous prime is 68309749. The next prime is 68309767. The reversal of 68309761 is 16790386.

It can be written as a sum of positive squares in 4 ways, for example, as 7952400 + 60357361 = 2820^2 + 7769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68309761 - 2¹¹ = 68307713 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 90220 + ... + 90973.

It is an arithmetic number, because the mean of its divisors is an integer number (9512685).

Almost surely, 2^68309761 is an apocalyptic number.

It is an amenable number.

68309761 is a deficient number, since it is larger than the sum of its proper divisors (7791719).

68309761 is a wasteful number, since it uses less digits than its factorization.

68309761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181235.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 68309761 is about 8264.9719297769. The cubic root of 68309761 is about 408.7843447966.

The spelling of 68309761 in words is "sixty-eight million, three hundred nine thousand, seven hundred sixty-one".