68400645 has 16 divisors (see below), whose sum is σ = 109916352. Its totient is φ = 36321920.

The previous prime is 68400641. The next prime is 68400677. The reversal of 68400645 is 54600486.

It is a happy number.

It is not a de Polignac number, because 68400645 - 2² = 68400641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68400641) 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 15 ways as a sum of consecutive naturals, for example, 6291 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (6869772).

Almost surely, 2^68400645 is an apocalyptic number.

It is an amenable number.

68400645 is a deficient number, since it is larger than the sum of its proper divisors (41515707).

68400645 is a wasteful number, since it uses less digits than its factorization.

68400645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19812.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 68400645 is about 8270.4682455106. The cubic root of 68400645 is about 408.9655560491.

The spelling of 68400645 in words is "sixty-eight million, four hundred thousand, six hundred forty-five".