220728407 has 2 divisors, whose sum is σ = 220728408. Its totient is φ = 220728406.

The previous prime is 220728373. The next prime is 220728419. The reversal of 220728407 is 704827022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220728407 - 2¹⁰ = 220727383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220728107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110364203 + 110364204.

It is an arithmetic number, because the mean of its divisors is an integer number (110364204).

Almost surely, 2^220728407 is an apocalyptic number.

220728407 is a deficient number, since it is larger than the sum of its proper divisors (1).

220728407 is an equidigital number, since it uses as much as digits as its factorization.

220728407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 220728407 is about 14856.9312780264. The cubic root of 220728407 is about 604.3465905113.

The spelling of 220728407 in words is "two hundred twenty million, seven hundred twenty-eight thousand, four hundred seven".