220761664 has 28 divisors (see below), whose sum is σ = 452209408. Its totient is φ = 106819200.

The previous prime is 220761631. The next prime is 220761683. The reversal of 220761664 is 466167022.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53652 + ... + 57619.

It is an arithmetic number, because the mean of its divisors is an integer number (16150336).

Almost surely, 2^220761664 is an apocalyptic number.

It is an amenable number.

220761664 is an abundant number, since it is smaller than the sum of its proper divisors (231447744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220761664 is a wasteful number, since it uses less digits than its factorization.

220761664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111314 (or 111304 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 220761664 is about 14858.0504777713. The cubic root of 220761664 is about 604.3769411512.

The spelling of 220761664 in words is "two hundred twenty million, seven hundred sixty-one thousand, six hundred sixty-four".