645865846 has 8 divisors (see below), whose sum is σ = 970957800. Its totient is φ = 322213248.

The previous prime is 645865789. The next prime is 645865859. The reversal of 645865846 is 648568546.

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 = 645865793 and 645865802.

It is a congruent number.

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, 358716 + ... + 360511.

It is an arithmetic number, because the mean of its divisors is an integer number (121369725).

Almost surely, 2^645865846 is an apocalyptic number.

645865846 is a deficient number, since it is larger than the sum of its proper divisors (325091954).

645865846 is a wasteful number, since it uses less digits than its factorization.

645865846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719678.

The product of its digits is 5529600, while the sum is 52.

The square root of 645865846 is about 25413.8908079814. The cubic root of 645865846 is about 864.3987026956.

The spelling of 645865846 in words is "six hundred forty-five million, eight hundred sixty-five thousand, eight hundred forty-six".