68648731 has 2 divisors, whose sum is σ = 68648732. Its totient is φ = 68648730.

The previous prime is 68648651. The next prime is 68648753. The reversal of 68648731 is 13784686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68648731 - 2⁷ = 68648603 is a prime.

It is a super-2 number, since 2×68648731² = 9425296535820722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68648761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34324365 + 34324366.

It is an arithmetic number, because the mean of its divisors is an integer number (34324366).

Almost surely, 2^68648731 is an apocalyptic number.

68648731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68648731 is an equidigital number, since it uses as much as digits as its factorization.

68648731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 68648731 is about 8285.4529749435. The cubic root of 68648731 is about 409.4593925890.

The spelling of 68648731 in words is "sixty-eight million, six hundred forty-eight thousand, seven hundred thirty-one".