220979664 has 50 divisors (see below), whose sum is σ = 639583010. Its totient is φ = 73659456.

The previous prime is 220979657. The next prime is 220979711. The reversal of 220979664 is 466979022.

220979664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 210482064 + 10497600 = 14508^2 + 3240^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 83959 + ... + 86550.

Almost surely, 2^220979664 is an apocalyptic number.

220979664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

220979664 is an abundant number, since it is smaller than the sum of its proper divisors (418603346).

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

220979664 is a wasteful number, since it uses less digits than its factorization.

220979664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170529 (or 170514 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 220979664 is about 14865.3847578864. The cubic root of 220979664 is about 604.5758144911.

The spelling of 220979664 in words is "two hundred twenty million, nine hundred seventy-nine thousand, six hundred sixty-four".