220978775 has 12 divisors (see below), whose sum is σ = 276677232. Its totient is φ = 175064640.

The previous prime is 220978741. The next prime is 220978789. The reversal of 220978775 is 577879022.

It is not a de Polignac number, because 220978775 - 2⁶ = 220978711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40334 + ... + 45483.

It is an arithmetic number, because the mean of its divisors is an integer number (23056436).

Almost surely, 2^220978775 is an apocalyptic number.

220978775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

220978775 is a deficient number, since it is larger than the sum of its proper divisors (55698457).

220978775 is a wasteful number, since it uses less digits than its factorization.

220978775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85930 (or 85925 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 220978775 is about 14865.3548561748. The cubic root of 220978775 is about 604.5750037549.

The spelling of 220978775 in words is "two hundred twenty million, nine hundred seventy-eight thousand, seven hundred seventy-five".