210639136 has 24 divisors (see below), whose sum is σ = 418808124. Its totient is φ = 104275200.

The previous prime is 210639127. The next prime is 210639157. The reversal of 210639136 is 631936012.

It can be written as a sum of positive squares in 2 ways, for example, as 209091600 + 1547536 = 14460^2 + 1244^2 .

It is a super-2 number, since 2×210639136² = 88737691229652992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210639098 and 210639107.

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, 29355 + ... + 35818.

Almost surely, 2^210639136 is an apocalyptic number.

It is an amenable number.

210639136 is a deficient number, since it is larger than the sum of its proper divisors (208168988).

210639136 is a wasteful number, since it uses less digits than its factorization.

210639136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65284 (or 65276 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 210639136 is about 14513.4122796812. The cubic root of 210639136 is about 594.9945963777.

The spelling of 210639136 in words is "two hundred ten million, six hundred thirty-nine thousand, one hundred thirty-six".