643045634 has 32 divisors (see below), whose sum is σ = 1228179456. Its totient is φ = 245203920.

The previous prime is 643045619. The next prime is 643045649. The reversal of 643045634 is 436540346.

It is an interprime number because it is at equal distance from previous prime (643045619) and next prime (643045649).

It is a junction number, because it is equal to n+sod(n) for n = 643045594 and 643045603.

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, 37184 + ... + 51659.

It is an arithmetic number, because the mean of its divisors is an integer number (38380608).

Almost surely, 2^643045634 is an apocalyptic number.

643045634 is a deficient number, since it is larger than the sum of its proper divisors (585133822).

643045634 is a wasteful number, since it uses less digits than its factorization.

643045634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88910.

The product of its (nonzero) digits is 103680, while the sum is 35.

The square root of 643045634 is about 25358.3444648897. The cubic root of 643045634 is about 863.1387173645.

The spelling of 643045634 in words is "six hundred forty-three million, forty-five thousand, six hundred thirty-four".