222166640 has 80 divisors (see below), whose sum is σ = 529445280. Its totient is φ = 86676480.

The previous prime is 222166627. The next prime is 222166657. The reversal of 222166640 is 46661222.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 970046 + ... + 970274.

It is an arithmetic number, because the mean of its divisors is an integer number (6618066).

Almost surely, 2^222166640 is an apocalyptic number.

222166640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222166640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264722640).

222166640 is an abundant number, since it is smaller than the sum of its proper divisors (307278640).

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

222166640 is a wasteful number, since it uses less digits than its factorization.

222166640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 222166640 is about 14905.2554490019. The cubic root of 222166640 is about 605.6563602662.

The spelling of 222166640 in words is "two hundred twenty-two million, one hundred sixty-six thousand, six hundred forty".