220978611 has 48 divisors (see below), whose sum is σ = 381099264. Its totient is φ = 125341344.

The previous prime is 220978601. The next prime is 220978613. The reversal of 220978611 is 116879022.

It is not a de Polignac number, because 220978611 - 2⁹ = 220978099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220978613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 276865 + ... + 277661.

It is an arithmetic number, because the mean of its divisors is an integer number (7939568).

Almost surely, 2^220978611 is an apocalyptic number.

220978611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

220978611 is a deficient number, since it is larger than the sum of its proper divisors (160120653).

220978611 is an equidigital number, since it uses as much as digits as its factorization.

220978611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 970 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 220978611 is about 14865.3493399920. The cubic root of 220978611 is about 604.5748541926.

The spelling of 220978611 in words is "two hundred twenty million, nine hundred seventy-eight thousand, six hundred eleven".