68917649 has 4 divisors (see below), whose sum is σ = 70218036. Its totient is φ = 67617264.

The previous prime is 68917633. The next prime is 68917657. The reversal of 68917649 is 94671986.

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 55726225 + 13191424 = 7465^2 + 3632^2 .

It is a cyclic number.

It is not a de Polignac number, because 68917649 - 2⁴ = 68917633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68917597 and 68917606.

It is not an unprimeable number, because it can be changed into a prime (68917699) 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, 650114 + ... + 650219.

It is an arithmetic number, because the mean of its divisors is an integer number (17554509).

Almost surely, 2^68917649 is an apocalyptic number.

It is an amenable number.

68917649 is a deficient number, since it is larger than the sum of its proper divisors (1300387).

68917649 is a wasteful number, since it uses less digits than its factorization.

68917649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300386.

The product of its digits is 653184, while the sum is 50.

The square root of 68917649 is about 8301.6654353208. The cubic root of 68917649 is about 409.9933550381.

The spelling of 68917649 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred forty-nine".