68021385 has 16 divisors (see below), whose sum is σ = 112587840. Its totient is φ = 35026880.

The previous prime is 68021383. The next prime is 68021407. The reversal of 68021385 is 58312086.

It is a happy number.

It is not a de Polignac number, because 68021385 - 2¹ = 68021383 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68021381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77751 + ... + 78620.

It is an arithmetic number, because the mean of its divisors is an integer number (7036740).

Almost surely, 2^68021385 is an apocalyptic number.

It is an amenable number.

68021385 is a deficient number, since it is larger than the sum of its proper divisors (44566455).

68021385 is a wasteful number, since it uses less digits than its factorization.

68021385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156408.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 68021385 is about 8247.5078053919. The cubic root of 68021385 is about 408.2082930574.

The spelling of 68021385 in words is "sixty-eight million, twenty-one thousand, three hundred eighty-five".