68431761 has 6 divisors (see below), whose sum is σ = 98845890. Its totient is φ = 45621168.

The previous prime is 68431697. The next prime is 68431771. The reversal of 68431761 is 16713486.

It can be written as a sum of positive squares in only one way, i.e., 36723600 + 31708161 = 6060^2 + 5631^2 .

It is not a de Polignac number, because 68431761 - 2⁶ = 68431697 is a prime.

It is a super-2 number, since 2×68431761² = 9365811827122242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68431771) 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 5 ways as a sum of consecutive naturals, for example, 3801756 + ... + 3801773.

It is an arithmetic number, because the mean of its divisors is an integer number (16474315).

Almost surely, 2^68431761 is an apocalyptic number.

It is an amenable number.

68431761 is a deficient number, since it is larger than the sum of its proper divisors (30414129).

68431761 is a wasteful number, since it uses less digits than its factorization.

68431761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7603535 (or 7603532 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 68431761 is about 8272.3491826687. The cubic root of 68431761 is about 409.0275605478.

The spelling of 68431761 in words is "sixty-eight million, four hundred thirty-one thousand, seven hundred sixty-one".