645782299 has 4 divisors (see below), whose sum is σ = 660800536. Its totient is φ = 630764064.

The previous prime is 645782287. The next prime is 645782311. The reversal of 645782299 is 992287546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 992287546 = 2 ⋅496143773.

It is an interprime number because it is at equal distance from previous prime (645782287) and next prime (645782311).

It is a cyclic number.

It is not a de Polignac number, because 645782299 - 2⁷ = 645782171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645782099) by changing a digit.

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, 7509054 + ... + 7509139.

It is an arithmetic number, because the mean of its divisors is an integer number (165200134).

Almost surely, 2^645782299 is an apocalyptic number.

645782299 is a deficient number, since it is larger than the sum of its proper divisors (15018237).

645782299 is a wasteful number, since it uses less digits than its factorization.

645782299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15018236.

The product of its digits is 2177280, while the sum is 52.

The square root of 645782299 is about 25412.2470277620. The cubic root of 645782299 is about 864.3614292004.

The spelling of 645782299 in words is "six hundred forty-five million, seven hundred eighty-two thousand, two hundred ninety-nine".