68558399 has 36 divisors (see below), whose sum is σ = 91625904. Its totient is φ = 50948352.

The previous prime is 68558389. The next prime is 68558411. The reversal of 68558399 is 99385586.

It is a Cunningham number, because it is equal to 8280²-1.

It is not a de Polignac number, because 68558399 - 2¹⁶ = 68492863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68558399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68558359) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 140534 + ... + 141020.

It is an arithmetic number, because the mean of its divisors is an integer number (2545164).

Almost surely, 2^68558399 is an apocalyptic number.

68558399 is a deficient number, since it is larger than the sum of its proper divisors (23067505).

68558399 is a wasteful number, since it uses less digits than its factorization.

68558399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 524 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 53.

The square root of 68558399 is about 8279.9999396135. Note that the first 4 decimals coincide. The cubic root of 68558399 is about 409.2797169149.

The spelling of 68558399 in words is "sixty-eight million, five hundred fifty-eight thousand, three hundred ninety-nine".