646689436 has 12 divisors (see below), whose sum is σ = 1180911312. Its totient is φ = 309286208.

The previous prime is 646689431. The next prime is 646689443. The reversal of 646689436 is 634986646.

646689436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646689431) 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, 3514525 + ... + 3514708.

It is an arithmetic number, because the mean of its divisors is an integer number (98409276).

Almost surely, 2^646689436 is an apocalyptic number.

It is an amenable number.

646689436 is a deficient number, since it is larger than the sum of its proper divisors (534221876).

646689436 is a wasteful number, since it uses less digits than its factorization.

646689436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7029260 (or 7029258 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 52.

The square root of 646689436 is about 25430.0891858444. The cubic root of 646689436 is about 864.7659656205.

The spelling of 646689436 in words is "six hundred forty-six million, six hundred eighty-nine thousand, four hundred thirty-six".