556221720 has 32 divisors (see below), whose sum is σ = 1668665520. Its totient is φ = 148325760.

The previous prime is 556221709. The next prime is 556221763. The reversal of 556221720 is 27122655.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2317471 + ... + 2317710.

Almost surely, 2^556221720 is an apocalyptic number.

It is an amenable number.

556221720 is an abundant number, since it is smaller than the sum of its proper divisors (1112443800).

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

556221720 is a wasteful number, since it uses less digits than its factorization.

556221720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635195 (or 4635191 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 556221720 is about 23584.3532877202. The cubic root of 556221720 is about 822.3991407570.

The spelling of 556221720 in words is "five hundred fifty-six million, two hundred twenty-one thousand, seven hundred twenty".