220628638 has 4 divisors (see below), whose sum is σ = 330942960. Its totient is φ = 110314318.

The previous prime is 220628623. The next prime is 220628641. The reversal of 220628638 is 836826022.

220628638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 220628597 and 220628606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55157158 + ... + 55157161.

It is an arithmetic number, because the mean of its divisors is an integer number (82735740).

Almost surely, 2^220628638 is an apocalyptic number.

220628638 is a deficient number, since it is larger than the sum of its proper divisors (110314322).

220628638 is a wasteful number, since it uses less digits than its factorization.

220628638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110314321.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 220628638 is about 14853.5732401332. The cubic root of 220628638 is about 604.2555221217.

The spelling of 220628638 in words is "two hundred twenty million, six hundred twenty-eight thousand, six hundred thirty-eight".