210676640 has 24 divisors (see below), whose sum is σ = 497723940. Its totient is φ = 84270592.

The previous prime is 210676639. The next prime is 210676663. The reversal of 210676640 is 46676012.

It can be written as a sum of positive squares in 2 ways, for example, as 181818256 + 28858384 = 13484^2 + 5372^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 210676597 and 210676606.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 658205 + ... + 658524.

Almost surely, 2^210676640 is an apocalyptic number.

210676640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210676640 is an abundant number, since it is smaller than the sum of its proper divisors (287047300).

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

210676640 is a wasteful number, since it uses less digits than its factorization.

210676640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316744 (or 1316736 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 210676640 is about 14514.7042684307. The cubic root of 210676640 is about 595.0299069307.

The spelling of 210676640 in words is "two hundred ten million, six hundred seventy-six thousand, six hundred forty".