68345731 has 4 divisors (see below), whose sum is σ = 70550464. Its totient is φ = 66141000.

The previous prime is 68345701. The next prime is 68345749. The reversal of 68345731 is 13754386.

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 68345731 - 2¹³ = 68337539 is a prime.

It is a super-2 number, since 2×68345731² = 9342277891848722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68345701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1102320 + ... + 1102381.

It is an arithmetic number, because the mean of its divisors is an integer number (17637616).

Almost surely, 2^68345731 is an apocalyptic number.

68345731 is a deficient number, since it is larger than the sum of its proper divisors (2204733).

68345731 is a wasteful number, since it uses less digits than its factorization.

68345731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204732.

The product of its digits is 60480, while the sum is 37.

The square root of 68345731 is about 8267.1476943381. The cubic root of 68345731 is about 408.8560836546.

The spelling of 68345731 in words is "sixty-eight million, three hundred forty-five thousand, seven hundred thirty-one".