645703538 has 8 divisors (see below), whose sum is σ = 968663280. Its totient is φ = 322815780.

The previous prime is 645703529. The next prime is 645703549. The reversal of 645703538 is 835307546.

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

It is a junction number, because it is equal to n+sod(n) for n = 645703495 and 645703504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24533 + ... + 43511.

It is an arithmetic number, because the mean of its divisors is an integer number (121082910).

Almost surely, 2^645703538 is an apocalyptic number.

645703538 is a deficient number, since it is larger than the sum of its proper divisors (322959742).

645703538 is a wasteful number, since it uses less digits than its factorization.

645703538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35992.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 645703538 is about 25410.6973143202. The cubic root of 645703538 is about 864.3262879779.

The spelling of 645703538 in words is "six hundred forty-five million, seven hundred three thousand, five hundred thirty-eight".