68748749 has 8 divisors (see below), whose sum is σ = 69451800. Its totient is φ = 68049216.

The previous prime is 68748739. The next prime is 68748761. The reversal of 68748749 is 94784786.

It can be written as a sum of positive squares in 4 ways, for example, as 7236100 + 61512649 = 2690^2 + 7843^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 68748749 - 2¹² = 68744653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68748749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68748739) 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 7 ways as a sum of consecutive naturals, for example, 54959 + ... + 56195.

It is an arithmetic number, because the mean of its divisors is an integer number (8681475).

Almost surely, 2^68748749 is an apocalyptic number.

It is an amenable number.

68748749 is a deficient number, since it is larger than the sum of its proper divisors (703051).

68748749 is a wasteful number, since it uses less digits than its factorization.

68748749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its digits is 2709504, while the sum is 53.

The square root of 68748749 is about 8291.4865374069. The cubic root of 68748749 is about 409.6581505073.

The spelling of 68748749 in words is "sixty-eight million, seven hundred forty-eight thousand, seven hundred forty-nine".