556321840 has 20 divisors (see below), whose sum is σ = 1293448464. Its totient is φ = 222528704.

The previous prime is 556321811. The next prime is 556321853. The reversal of 556321840 is 48123655.

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

It is a junction number, because it is equal to n+sod(n) for n = 556321796 and 556321805.

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, 3476932 + ... + 3477091.

Almost surely, 2^556321840 is an apocalyptic number.

It is an amenable number.

556321840 is an abundant number, since it is smaller than the sum of its proper divisors (737126624).

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

556321840 is a wasteful number, since it uses less digits than its factorization.

556321840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6954036 (or 6954030 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 556321840 is about 23586.4757859244. The cubic root of 556321840 is about 822.4484817896.

The spelling of 556321840 in words is "five hundred fifty-six million, three hundred twenty-one thousand, eight hundred forty".