244626640 has 20 divisors (see below), whose sum is σ = 568757124. Its totient is φ = 97850624.

The previous prime is 244626637. The next prime is 244626659. The reversal of 244626640 is 46626442.

It can be written as a sum of positive squares in 2 ways, for example, as 50637456 + 193989184 = 7116^2 + 13928^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 244626596 and 244626605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528837 + ... + 1528996.

Almost surely, 2^244626640 is an apocalyptic number.

244626640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

244626640 is an abundant number, since it is smaller than the sum of its proper divisors (324130484).

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

244626640 is a wasteful number, since it uses less digits than its factorization.

244626640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057846 (or 3057840 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 244626640 is about 15640.5447475464. The cubic root of 244626640 is about 625.4144578987.

The spelling of 244626640 in words is "two hundred forty-four million, six hundred twenty-six thousand, six hundred forty".