216397628 has 12 divisors (see below), whose sum is σ = 378942480. Its totient is φ = 108128352.

The previous prime is 216397613. The next prime is 216397633. The reversal of 216397628 is 826793612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10376 + ... + 23247.

It is an arithmetic number, because the mean of its divisors is an integer number (31578540).

Almost surely, 2^216397628 is an apocalyptic number.

It is an amenable number.

216397628 is a deficient number, since it is larger than the sum of its proper divisors (162544852).

216397628 is a wasteful number, since it uses less digits than its factorization.

216397628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35236 (or 35234 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 216397628 is about 14710.4598160629. The cubic root of 216397628 is about 600.3679483846.

The spelling of 216397628 in words is "two hundred sixteen million, three hundred ninety-seven thousand, six hundred twenty-eight".