556007638 has 4 divisors (see below), whose sum is σ = 834011460. Its totient is φ = 278003818.

The previous prime is 556007597. The next prime is 556007657. The reversal of 556007638 is 836700655.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 556007638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139001908 + ... + 139001911.

It is an arithmetic number, because the mean of its divisors is an integer number (208502865).

Almost surely, 2^556007638 is an apocalyptic number.

556007638 is a deficient number, since it is larger than the sum of its proper divisors (278003822).

556007638 is a wasteful number, since it uses less digits than its factorization.

556007638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278003821.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 556007638 is about 23579.8142062231. The cubic root of 556007638 is about 822.2936172225.

The spelling of 556007638 in words is "five hundred fifty-six million, seven thousand, six hundred thirty-eight".