68623649 has 4 divisors (see below), whose sum is σ = 72235440. Its totient is φ = 65011860.

The previous prime is 68623637. The next prime is 68623661. The reversal of 68623649 is 94632686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94632686 = 2 ⋅47316343.

It is an interprime number because it is at equal distance from previous prime (68623637) and next prime (68623661).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68623649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68623609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805867 + ... + 1805904.

It is an arithmetic number, because the mean of its divisors is an integer number (18058860).

Almost surely, 2^68623649 is an apocalyptic number.

It is an amenable number.

68623649 is a deficient number, since it is larger than the sum of its proper divisors (3611791).

68623649 is a wasteful number, since it uses less digits than its factorization.

68623649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611790.

The product of its digits is 373248, while the sum is 44.

The square root of 68623649 is about 8283.9392199605. The cubic root of 68623649 is about 409.4095188265.

The spelling of 68623649 in words is "sixty-eight million, six hundred twenty-three thousand, six hundred forty-nine".