644462434 has 16 divisors (see below), whose sum is σ = 1205228736. Its totient is φ = 251089200.

The previous prime is 644462431. The next prime is 644462437. The reversal of 644462434 is 434264446.

It is an interprime number because it is at equal distance from previous prime (644462431) and next prime (644462437).

It is a junction number, because it is equal to n+sod(n) for n = 644462393 and 644462402.

It is not an unprimeable number, because it can be changed into a prime (644462431) 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, 2092257 + ... + 2092564.

It is an arithmetic number, because the mean of its divisors is an integer number (75326796).

Almost surely, 2^644462434 is an apocalyptic number.

644462434 is a deficient number, since it is larger than the sum of its proper divisors (560766302).

644462434 is a wasteful number, since it uses less digits than its factorization.

644462434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184841.

The product of its digits is 221184, while the sum is 37.

The square root of 644462434 is about 25386.2646720623. The cubic root of 644462434 is about 863.7721601806.

The spelling of 644462434 in words is "six hundred forty-four million, four hundred sixty-two thousand, four hundred thirty-four".