645840795 has 16 divisors (see below), whose sum is σ = 1094130720. Its totient is φ = 324186624.

The previous prime is 645840773. The next prime is 645840803. The reversal of 645840795 is 597048546.

It is not a de Polignac number, because 645840795 - 2²³ = 637452187 is a prime.

It is a super-2 number, since 2×645840795² = 834220664972464050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266100 + ... + 1266609.

It is an arithmetic number, because the mean of its divisors is an integer number (68383170).

Almost surely, 2^645840795 is an apocalyptic number.

645840795 is a deficient number, since it is larger than the sum of its proper divisors (448289925).

645840795 is a wasteful number, since it uses less digits than its factorization.

645840795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532734.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The square root of 645840795 is about 25413.3979428175. The cubic root of 645840795 is about 864.3875268289.

The spelling of 645840795 in words is "six hundred forty-five million, eight hundred forty thousand, seven hundred ninety-five".