221664064 has 28 divisors (see below), whose sum is σ = 458992224. Its totient is φ = 106012544.

The previous prime is 221664049. The next prime is 221664067. The reversal of 221664064 is 460466122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221664067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73822 + ... + 76765.

Almost surely, 2^221664064 is an apocalyptic number.

It is an amenable number.

221664064 is an abundant number, since it is smaller than the sum of its proper divisors (237328160).

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

221664064 is a wasteful number, since it uses less digits than its factorization.

221664064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150622 (or 150612 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 221664064 is about 14888.3868837426. The cubic root of 221664064 is about 605.1993187040.

The spelling of 221664064 in words is "two hundred twenty-one million, six hundred sixty-four thousand, sixty-four".