68640359 has 2 divisors, whose sum is σ = 68640360. Its totient is φ = 68640358.

The previous prime is 68640337. The next prime is 68640379. The reversal of 68640359 is 95304686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68640359 - 2²⁴ = 51863143 is a prime.

It is a super-2 number, since 2×68640359² = 9422997767297762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68640329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34320179 + 34320180.

It is an arithmetic number, because the mean of its divisors is an integer number (34320180).

Almost surely, 2^68640359 is an apocalyptic number.

68640359 is a deficient number, since it is larger than the sum of its proper divisors (1).

68640359 is an equidigital number, since it uses as much as digits as its factorization.

68640359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 68640359 is about 8284.9477367090. The cubic root of 68640359 is about 409.4427468169.

The spelling of 68640359 in words is "sixty-eight million, six hundred forty thousand, three hundred fifty-nine".