68280399 has 48 divisors (see below), whose sum is σ = 113577984. Its totient is φ = 39124800.

The previous prime is 68280391. The next prime is 68280419. The reversal of 68280399 is 99308286.

It is not a de Polignac number, because 68280399 - 2³ = 68280391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68280391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 357394 + ... + 357584.

It is an arithmetic number, because the mean of its divisors is an integer number (2366208).

Almost surely, 2^68280399 is an apocalyptic number.

68280399 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

68280399 is a deficient number, since it is larger than the sum of its proper divisors (45297585).

68280399 is a wasteful number, since it uses less digits than its factorization.

68280399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 68280399 is about 8263.1954472831. The cubic root of 68280399 is about 408.7257663157.

The spelling of 68280399 in words is "sixty-eight million, two hundred eighty thousand, three hundred ninety-nine".