220628687 has 4 divisors (see below), whose sum is σ = 221338416. Its totient is φ = 219918960.

The previous prime is 220628659. The next prime is 220628693. The reversal of 220628687 is 786826022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220628687 - 2⁶ = 220628623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220628647) 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, 354398 + ... + 355019.

It is an arithmetic number, because the mean of its divisors is an integer number (55334604).

Almost surely, 2^220628687 is an apocalyptic number.

220628687 is a deficient number, since it is larger than the sum of its proper divisors (709729).

220628687 is an equidigital number, since it uses as much as digits as its factorization.

220628687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709728.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 220628687 is about 14853.5748895678. The cubic root of 220628687 is about 604.2555668552.

The spelling of 220628687 in words is "two hundred twenty million, six hundred twenty-eight thousand, six hundred eighty-seven".