68907785 has 4 divisors (see below), whose sum is σ = 82689348. Its totient is φ = 55126224.

The previous prime is 68907779. The next prime is 68907821. The reversal of 68907785 is 58770986.

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 33825856 + 35081929 = 5816^2 + 5923^2 .

It is a cyclic number.

It is not a de Polignac number, because 68907785 - 2¹⁴ = 68891401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6890774 + ... + 6890783.

It is an arithmetic number, because the mean of its divisors is an integer number (20672337).

Almost surely, 2^68907785 is an apocalyptic number.

It is an amenable number.

68907785 is a deficient number, since it is larger than the sum of its proper divisors (13781563).

68907785 is a wasteful number, since it uses less digits than its factorization.

68907785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13781562.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 68907785 is about 8301.0713164025. The cubic root of 68907785 is about 409.9737936849.

The spelling of 68907785 in words is "sixty-eight million, nine hundred seven thousand, seven hundred eighty-five".