68679731 has 2 divisors, whose sum is σ = 68679732. Its totient is φ = 68679730.

The previous prime is 68679719. The next prime is 68679739. The reversal of 68679731 is 13797686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68679731 - 2¹⁰ = 68678707 is a prime.

It is a super-2 number, since 2×68679731² = 9433810900464722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68679739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34339865 + 34339866.

It is an arithmetic number, because the mean of its divisors is an integer number (34339866).

Almost surely, 2^68679731 is an apocalyptic number.

68679731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68679731 is an equidigital number, since it uses as much as digits as its factorization.

68679731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 68679731 is about 8287.3235124496. The cubic root of 68679731 is about 409.5210170882.

The spelling of 68679731 in words is "sixty-eight million, six hundred seventy-nine thousand, seven hundred thirty-one".