645422707 has 4 divisors (see below), whose sum is σ = 645604960. Its totient is φ = 645240456.

The previous prime is 645422693. The next prime is 645422741. The reversal of 645422707 is 707224546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645422707 - 2¹⁵ = 645389939 is a prime.

It is a super-2 number, since 2×645422707² = 833140941422415698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645422797) by changing a digit.

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, 85707 + ... + 92932.

It is an arithmetic number, because the mean of its divisors is an integer number (161401240).

Almost surely, 2^645422707 is an apocalyptic number.

645422707 is a deficient number, since it is larger than the sum of its proper divisors (182253).

645422707 is a wasteful number, since it uses less digits than its factorization.

645422707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182252.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 645422707 is about 25405.1708713010. The cubic root of 645422707 is about 864.2009648228.

It can be divided in two parts, 6454 and 22707, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 645422707 in words is "six hundred forty-five million, four hundred twenty-two thousand, seven hundred seven".