40644585 has 20 divisors (see below), whose sum is σ = 72859908. Its totient is φ = 21676896.

The previous prime is 40644557. The next prime is 40644601. The reversal of 40644585 is 58544604.

40644585 is a `hidden beast` number, since 4 + 0 + 644 + 5 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12257001 + 28387584 = 3501^2 + 5328^2 .

It is not a de Polignac number, because 40644585 - 2¹⁷ = 40513513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49774 + ... + 50583.

Almost surely, 2^40644585 is an apocalyptic number.

40644585 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40644585 is a deficient number, since it is larger than the sum of its proper divisors (32215323).

40644585 is a wasteful number, since it uses less digits than its factorization.

40644585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100374 (or 100365 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 40644585 is about 6375.3105806698. The cubic root of 40644585 is about 343.8224504039.

It can be divided in two parts, 4064 and 4585, that added together give a square (8649 = 93²).

The spelling of 40644585 in words is "forty million, six hundred forty-four thousand, five hundred eighty-five".