556978 has 4 divisors (see below), whose sum is σ = 835470. Its totient is φ = 278488.

The previous prime is 556967. The next prime is 556981. The reversal of 556978 is 879655.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 480249 + 76729 = 693^2 + 277^2 .

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 556978.

It is an unprimeable number.

556978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139243 + ... + 139246.

2⁵⁵⁶⁹⁷⁸ is an apocalyptic number.

556978 is a deficient number, since it is larger than the sum of its proper divisors (278492).

556978 is a wasteful number, since it uses less digits than its factorization.

556978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278491.

The product of its digits is 75600, while the sum is 40.

The square root of 556978 is about 746.3095872358. The cubic root of 556978 is about 82.2771703426.

The spelling of 556978 in words is "five hundred fifty-six thousand, nine hundred seventy-eight".