645234434 has 16 divisors (see below), whose sum is σ = 1075925760. Its totient is φ = 288193680.

The previous prime is 645234431. The next prime is 645234437. The reversal of 645234434 is 434432546.

It is an interprime number because it is at equal distance from previous prime (645234431) and next prime (645234437).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 645234394 and 645234403.

It is not an unprimeable number, because it can be changed into a prime (645234431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399464 + ... + 401075.

It is an arithmetic number, because the mean of its divisors is an integer number (67245360).

Almost surely, 2^645234434 is an apocalyptic number.

645234434 is a deficient number, since it is larger than the sum of its proper divisors (430691326).

645234434 is a wasteful number, since it uses less digits than its factorization.

645234434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800585.

The product of its digits is 138240, while the sum is 35.

The square root of 645234434 is about 25401.4651939608. The cubic root of 645234434 is about 864.1169260837.

The spelling of 645234434 in words is "six hundred forty-five million, two hundred thirty-four thousand, four hundred thirty-four".