645379706 has 8 divisors (see below), whose sum is σ = 968539680. Its totient is φ = 322533148.

The previous prime is 645379699. The next prime is 645379727. The reversal of 645379706 is 607973546.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73136 + ... + 81483.

It is an arithmetic number, because the mean of its divisors is an integer number (121067460).

Almost surely, 2^645379706 is an apocalyptic number.

645379706 is a deficient number, since it is larger than the sum of its proper divisors (323159974).

645379706 is a wasteful number, since it uses less digits than its factorization.

645379706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156708.

The product of its (nonzero) digits is 952560, while the sum is 47.

The square root of 645379706 is about 25404.3245531150. The cubic root of 645379706 is about 864.1817720620.

The spelling of 645379706 in words is "six hundred forty-five million, three hundred seventy-nine thousand, seven hundred six".