209928104 has 16 divisors (see below), whose sum is σ = 416769300. Its totient is φ = 98789632.

The previous prime is 209928101. The next prime is 209928113. The reversal of 209928104 is 401829902.

209928104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 186868900 + 23059204 = 13670^2 + 4802^2 .

It is not an unprimeable number, because it can be changed into a prime (209928101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771659 + ... + 771930.

Almost surely, 2^209928104 is an apocalyptic number.

It is an amenable number.

209928104 is a deficient number, since it is larger than the sum of its proper divisors (206841196).

209928104 is a wasteful number, since it uses less digits than its factorization.

209928104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543612 (or 1543608 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 209928104 is about 14488.8958861605. The cubic root of 209928104 is about 594.3243551190.

It can be divided in two parts, 2099 and 28104, that added together give a palindrome (30203).

The spelling of 209928104 in words is "two hundred nine million, nine hundred twenty-eight thousand, one hundred four".