556559640 has 384 divisors, whose sum is σ = 2326968000. Its totient is φ = 117282816.

The previous prime is 556559639. The next prime is 556559683. The reversal of 556559640 is 46955655.

556559640 is a `hidden beast` number, since 5 + 56 + 5 + 596 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 687556 + ... + 688364.

Almost surely, 2^556559640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556559640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163484000).

556559640 is an abundant number, since it is smaller than the sum of its proper divisors (1770408360).

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

556559640 is a wasteful number, since it uses less digits than its factorization.

556559640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 556559640 is about 23591.5162717448. The cubic root of 556559640 is about 822.5656504109.

The spelling of 556559640 in words is "five hundred fifty-six million, five hundred fifty-nine thousand, six hundred forty".