209872188604 has 24 divisors (see below), whose sum is σ = 395999866080. Its totient is φ = 96748615104.

The previous prime is 209872188577. The next prime is 209872188611. The reversal of 209872188604 is 406881278902.

It is a happy number.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2361619 + ... + 2448874.

It is an arithmetic number, because the mean of its divisors is an integer number (16499994420).

Almost surely, 2^209872188604 is an apocalyptic number.

It is an amenable number.

209872188604 is a deficient number, since it is larger than the sum of its proper divisors (186127677476).

209872188604 is a wasteful number, since it uses less digits than its factorization.

209872188604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4811349 (or 4811347 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 209872188604 in words is "two hundred nine billion, eight hundred seventy-two million, one hundred eighty-eight thousand, six hundred four".