64844646 has 16 divisors (see below), whose sum is σ = 133194864. Its totient is φ = 21030624.

The previous prime is 64844641. The next prime is 64844669. The reversal of 64844646 is 64644846.

It is a happy number.

It is a super-2 number, since 2×64844646² = 8409656229730632, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64844598 and 64844607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64844641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145825 + ... + 146268.

It is an arithmetic number, because the mean of its divisors is an integer number (8324679).

Almost surely, 2^64844646 is an apocalyptic number.

64844646 is an abundant number, since it is smaller than the sum of its proper divisors (68350218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64844646 is a wasteful number, since it uses less digits than its factorization.

64844646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292135.

The product of its digits is 442368, while the sum is 42.

The square root of 64844646 is about 8052.6173384807. The cubic root of 64844646 is about 401.7519942534.

The spelling of 64844646 in words is "sixty-four million, eight hundred forty-four thousand, six hundred forty-six".