6401636 has 24 divisors (see below), whose sum is σ = 11793600. Its totient is φ = 3034592.

The previous prime is 6401621. The next prime is 6401669. The reversal of 6401636 is 6361046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13475 + ... + 13941.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^6401636 is an apocalyptic number.

It is an amenable number.

6401636 is a deficient number, since it is larger than the sum of its proper divisors (5391964).

6401636 is a wasteful number, since it uses less digits than its factorization.

6401636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 6401636 is about 2530.1454503645. The cubic root of 6401636 is about 185.6793720786.

The spelling of 6401636 in words is "six million, four hundred one thousand, six hundred thirty-six".