210639056 has 20 divisors (see below), whose sum is σ = 409435104. Its totient is φ = 104978400.

The previous prime is 210639053. The next prime is 210639103. The reversal of 210639056 is 650936012.

It is a happy number.

It is a super-2 number, since 2×210639056² = 88737623825142272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210639053) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16190 + ... + 26141.

Almost surely, 2^210639056 is an apocalyptic number.

It is an amenable number.

210639056 is a deficient number, since it is larger than the sum of its proper divisors (198796048).

210639056 is a wasteful number, since it uses less digits than its factorization.

210639056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42650 (or 42644 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 210639056 is about 14513.4095236095. The cubic root of 210639056 is about 594.9945210521.

The spelling of 210639056 in words is "two hundred ten million, six hundred thirty-nine thousand, fifty-six".