68641731 has 24 divisors (see below), whose sum is σ = 101795616. Its totient is φ = 44553600.

The previous prime is 68641711. The next prime is 68641751. The reversal of 68641731 is 13714686.

68641731 is a `hidden beast` number, since 6 + 8 + 641 + 7 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (68641711) and next prime (68641751).

It is a de Polignac number, because none of the positive numbers 2^k-68641731 is a prime.

It is a super-2 number, since 2×68641731² = 9423374469352722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68641711) 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 23 ways as a sum of consecutive naturals, for example, 71551 + ... + 72503.

It is an arithmetic number, because the mean of its divisors is an integer number (4241484).

Almost surely, 2^68641731 is an apocalyptic number.

68641731 is a deficient number, since it is larger than the sum of its proper divisors (33153885).

68641731 is a wasteful number, since it uses less digits than its factorization.

68641731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1160 counting only the distinct ones).

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

The square root of 68641731 is about 8285.0305370590. The cubic root of 68641731 is about 409.4454748121.

The spelling of 68641731 in words is "sixty-eight million, six hundred forty-one thousand, seven hundred thirty-one".