216547428 has 48 divisors (see below), whose sum is σ = 537110784. Its totient is φ = 67668480.

The previous prime is 216547399. The next prime is 216547451. The reversal of 216547428 is 824745612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53326 + ... + 57242.

It is an arithmetic number, because the mean of its divisors is an integer number (11189808).

Almost surely, 2^216547428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216547428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268555392).

216547428 is an abundant number, since it is smaller than the sum of its proper divisors (320563356).

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

216547428 is a wasteful number, since it uses less digits than its factorization.

216547428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212 (or 4210 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 216547428 is about 14715.5505503532. The cubic root of 216547428 is about 600.5064501712.

The spelling of 216547428 in words is "two hundred sixteen million, five hundred forty-seven thousand, four hundred twenty-eight".