556689987 has 24 divisors (see below), whose sum is σ = 967349760. Its totient is φ = 301365360.

The previous prime is 556689979. The next prime is 556690009. The reversal of 556689987 is 789986655.

It is not a de Polignac number, because 556689987 - 2³ = 556689979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (556689967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231339 + ... + 233732.

It is an arithmetic number, because the mean of its divisors is an integer number (40306240).

Almost surely, 2^556689987 is an apocalyptic number.

556689987 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

556689987 is a deficient number, since it is larger than the sum of its proper divisors (410659773).

556689987 is a wasteful number, since it uses less digits than its factorization.

556689987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465103 (or 465100 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The square root of 556689987 is about 23594.2786920897. The cubic root of 556689987 is about 822.6298607177.

The spelling of 556689987 in words is "five hundred fifty-six million, six hundred eighty-nine thousand, nine hundred eighty-seven".