220778638 has 4 divisors (see below), whose sum is σ = 331167960. Its totient is φ = 110389318.

The previous prime is 220778617. The next prime is 220778639. The reversal of 220778638 is 836877022.

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 = 220778594 and 220778603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220778639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55194658 + ... + 55194661.

It is an arithmetic number, because the mean of its divisors is an integer number (82791990).

Almost surely, 2^220778638 is an apocalyptic number.

220778638 is a deficient number, since it is larger than the sum of its proper divisors (110389322).

220778638 is a wasteful number, since it uses less digits than its factorization.

220778638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110389321.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 220778638 is about 14858.6216722817. The cubic root of 220778638 is about 604.3924306028.

The spelling of 220778638 in words is "two hundred twenty million, seven hundred seventy-eight thousand, six hundred thirty-eight".