68153749 has 4 divisors (see below), whose sum is σ = 69087436. Its totient is φ = 67220064.

The previous prime is 68153737. The next prime is 68153759. The reversal of 68153749 is 94735186.

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 20295025 + 47858724 = 4505^2 + 6918^2 .

It is a cyclic number.

It is not a de Polignac number, because 68153749 - 2¹³ = 68145557 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 (68153759) 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, 466734 + ... + 466879.

It is an arithmetic number, because the mean of its divisors is an integer number (17271859).

Almost surely, 2^68153749 is an apocalyptic number.

It is an amenable number.

68153749 is a deficient number, since it is larger than the sum of its proper divisors (933687).

68153749 is an equidigital number, since it uses as much as digits as its factorization.

68153749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933686.

The product of its digits is 181440, while the sum is 43.

The square root of 68153749 is about 8255.5283901153. The cubic root of 68153749 is about 408.4729013763.

The spelling of 68153749 in words is "sixty-eight million, one hundred fifty-three thousand, seven hundred forty-nine".