556446640 has 20 divisors (see below), whose sum is σ = 1293738624. Its totient is φ = 222578624.

The previous prime is 556446623. The next prime is 556446643. The reversal of 556446640 is 46644655.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 556446593 and 556446602.

It is not an unprimeable number, because it can be changed into a prime (556446643) by changing a digit.

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, 3477712 + ... + 3477871.

Almost surely, 2^556446640 is an apocalyptic number.

It is an amenable number.

556446640 is an abundant number, since it is smaller than the sum of its proper divisors (737291984).

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

556446640 is a wasteful number, since it uses less digits than its factorization.

556446640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6955596 (or 6955590 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The square root of 556446640 is about 23589.1212214444. The cubic root of 556446640 is about 822.5099773059.

The spelling of 556446640 in words is "five hundred fifty-six million, four hundred forty-six thousand, six hundred forty".