211408728 has 32 divisors (see below), whose sum is σ = 528942960. Its totient is φ = 70413440.

The previous prime is 211408727. The next prime is 211408733. The reversal of 211408728 is 827804112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211408727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36598 + ... + 41978.

Almost surely, 2^211408728 is an apocalyptic number.

It is an amenable number.

211408728 is an abundant number, since it is smaller than the sum of its proper divisors (317534232).

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

211408728 is a wasteful number, since it uses less digits than its factorization.

211408728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027 (or 7023 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 211408728 is about 14539.9012376288. The cubic root of 211408728 is about 595.7183405558.

The spelling of 211408728 in words is "two hundred eleven million, four hundred eight thousand, seven hundred twenty-eight".