645269694 has 8 divisors (see below), whose sum is σ = 1290539400. Its totient is φ = 215089896.

The previous prime is 645269693. The next prime is 645269777. The reversal of 645269694 is 496962546.

It is a happy number.

645269694 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

645269694 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645269693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53772469 + ... + 53772480.

It is an arithmetic number, because the mean of its divisors is an integer number (161317425).

Almost surely, 2^645269694 is an apocalyptic number.

645269694 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645269694 is a wasteful number, since it uses less digits than its factorization.

645269694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107544954.

The product of its digits is 2799360, while the sum is 51.

The square root of 645269694 is about 25402.1592389309. The cubic root of 645269694 is about 864.1326662066.

The spelling of 645269694 in words is "six hundred forty-five million, two hundred sixty-nine thousand, six hundred ninety-four".