216428949 has 48 divisors (see below), whose sum is σ = 363973120. Its totient is φ = 126878400.

The previous prime is 216428929. The next prime is 216428951. The reversal of 216428949 is 949824612.

216428949 is a `hidden beast` number, since 216 + 428 + 9 + 4 + 9 = 666.

It is not a de Polignac number, because 216428949 - 2¹² = 216424853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216428909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100209 + ... + 102345.

Almost surely, 2^216428949 is an apocalyptic number.

It is an amenable number.

216428949 is a deficient number, since it is larger than the sum of its proper divisors (147544171).

216428949 is a wasteful number, since it uses less digits than its factorization.

216428949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199 (or 2182 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 216428949 is about 14711.5243601742. The cubic root of 216428949 is about 600.3969123764.

It can be divided in two parts, 2164 and 28949, that added together give a palindrome (31113).

The spelling of 216428949 in words is "two hundred sixteen million, four hundred twenty-eight thousand, nine hundred forty-nine".