209711028240 has 200 divisors, whose sum is σ = 832408716480. Its totient is φ = 47933938944.

The previous prime is 209711028227. The next prime is 209711028299. The reversal of 209711028240 is 42820117902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 209711028195 and 209711028204.

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 39 ways as a sum of consecutive naturals, for example, 2266270 + ... + 2356989.

Almost surely, 2^209711028240 is an apocalyptic number.

209711028240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209711028240 is an abundant number, since it is smaller than the sum of its proper divisors (622697688240).

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

209711028240 is a wasteful number, since it uses less digits than its factorization.

209711028240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623291 (or 4623276 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 209711028240 in words is "two hundred nine billion, seven hundred eleven million, twenty-eight thousand, two hundred forty".