220728415 has 8 divisors (see below), whose sum is σ = 278814960. Its totient is φ = 167288832.

The previous prime is 220728407. The next prime is 220728419. The reversal of 220728415 is 514827022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220728415 - 2³ = 220728407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220728419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161634 + ... + 1161823.

It is an arithmetic number, because the mean of its divisors is an integer number (34851870).

Almost surely, 2^220728415 is an apocalyptic number.

220728415 is a deficient number, since it is larger than the sum of its proper divisors (58086545).

220728415 is a wasteful number, since it uses less digits than its factorization.

220728415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323481.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 220728415 is about 14856.9315472610. The cubic root of 220728415 is about 604.3465978125.

The spelling of 220728415 in words is "two hundred twenty million, seven hundred twenty-eight thousand, four hundred fifteen".