606400640 has 32 divisors (see below), whose sum is σ = 1449678060. Its totient is φ = 242560000.

The previous prime is 606400631. The next prime is 606400649. The reversal of 606400640 is 46004606.

It is an interprime number because it is at equal distance from previous prime (606400631) and next prime (606400649).

It can be written as a sum of positive squares in 2 ways, for example, as 573315136 + 33085504 = 23944^2 + 5752^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (606400649) 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, 473111 + ... + 474390.

Almost surely, 2^606400640 is an apocalyptic number.

It is an amenable number.

606400640 is an abundant number, since it is smaller than the sum of its proper divisors (843277420).

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

606400640 is an equidigital number, since it uses as much as digits as its factorization.

606400640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947520 (or 947508 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 606400640 is about 24625.2033494142. The cubic root of 606400640 is about 846.4212348592.

The spelling of 606400640 in words is "six hundred six million, four hundred thousand, six hundred forty".