68213749 has 4 divisors (see below), whose sum is σ = 68317920. Its totient is φ = 68109580.

The previous prime is 68213737. The next prime is 68213759. The reversal of 68213749 is 94731286.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68213749 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 (68213759) 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, 51097 + ... + 52414.

It is an arithmetic number, because the mean of its divisors is an integer number (17079480).

Almost surely, 2^68213749 is an apocalyptic number.

It is an amenable number.

68213749 is a deficient number, since it is larger than the sum of its proper divisors (104171).

68213749 is a wasteful number, since it uses less digits than its factorization.

68213749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104170.

The product of its digits is 72576, while the sum is 40.

The square root of 68213749 is about 8259.1615191858. The cubic root of 68213749 is about 408.5927342829.

The spelling of 68213749 in words is "sixty-eight million, two hundred thirteen thousand, seven hundred forty-nine".