68651647 has 4 divisors (see below), whose sum is σ = 68875576. Its totient is φ = 68427720.

The previous prime is 68651641. The next prime is 68651669. The reversal of 68651647 is 74615686.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68651647 - 2⁷ = 68651519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68651641) 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, 111504 + ... + 112117.

It is an arithmetic number, because the mean of its divisors is an integer number (17218894).

Almost surely, 2^68651647 is an apocalyptic number.

68651647 is a deficient number, since it is larger than the sum of its proper divisors (223929).

68651647 is a wasteful number, since it uses less digits than its factorization.

68651647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223928.

The product of its digits is 241920, while the sum is 43.

The square root of 68651647 is about 8285.6289441418. The cubic root of 68651647 is about 409.4651900581.

The spelling of 68651647 in words is "sixty-eight million, six hundred fifty-one thousand, six hundred forty-seven".