556721890 has 8 divisors (see below), whose sum is σ = 1002099420. Its totient is φ = 222688752.

The previous prime is 556721887. The next prime is 556721917. The reversal of 556721890 is 98127655.

556721890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 556157889 + 564001 = 23583^2 + 751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27836085 + ... + 27836104.

Almost surely, 2^556721890 is an apocalyptic number.

556721890 is a deficient number, since it is larger than the sum of its proper divisors (445377530).

556721890 is a wasteful number, since it uses less digits than its factorization.

556721890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55672196.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 556721890 is about 23594.9547573205. The cubic root of 556721890 is about 822.6455749450.

The spelling of 556721890 in words is "five hundred fifty-six million, seven hundred twenty-one thousand, eight hundred ninety".