643610654 has 8 divisors (see below), whose sum is σ = 996558528. Its totient is φ = 311424480.

The previous prime is 643610651. The next prime is 643610657. The reversal of 643610654 is 456016346.

643610654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643610651) and next prime (643610657).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643610651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190347 + ... + 5190470.

It is an arithmetic number, because the mean of its divisors is an integer number (124569816).

Almost surely, 2^643610654 is an apocalyptic number.

643610654 is a deficient number, since it is larger than the sum of its proper divisors (352947874).

643610654 is a wasteful number, since it uses less digits than its factorization.

643610654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10380850.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 643610654 is about 25369.4827302411. The cubic root of 643610654 is about 863.3914458612.

The spelling of 643610654 in words is "six hundred forty-three million, six hundred ten thousand, six hundred fifty-four".