216728601 has 4 divisors (see below), whose sum is σ = 288971472. Its totient is φ = 144485732.

The previous prime is 216728587. The next prime is 216728621. The reversal of 216728601 is 106827612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216728601 - 2⁹ = 216728089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216728621) 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, 36121431 + ... + 36121436.

It is an arithmetic number, because the mean of its divisors is an integer number (72242868).

Almost surely, 2^216728601 is an apocalyptic number.

It is an amenable number.

216728601 is a deficient number, since it is larger than the sum of its proper divisors (72242871).

216728601 is an equidigital number, since it uses as much as digits as its factorization.

216728601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72242870.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 216728601 is about 14721.7050982554. The cubic root of 216728601 is about 600.6738734299.

The spelling of 216728601 in words is "two hundred sixteen million, seven hundred twenty-eight thousand, six hundred one".