222645540 has 96 divisors (see below), whose sum is σ = 673989120. Its totient is φ = 54590976.

The previous prime is 222645523. The next prime is 222645541. The reversal of 222645540 is 45546222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 222645498 and 222645507.

It is not an unprimeable number, because it can be changed into a prime (222645541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309301 + ... + 310019.

It is an arithmetic number, because the mean of its divisors is an integer number (7020720).

Almost surely, 2^222645540 is an apocalyptic number.

222645540 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 222645540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336994560).

222645540 is an abundant number, since it is smaller than the sum of its proper divisors (451343580).

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

222645540 is a wasteful number, since it uses less digits than its factorization.

222645540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 222645540 is about 14921.3116045474. The cubic root of 222645540 is about 606.0912300430.

The spelling of 222645540 in words is "two hundred twenty-two million, six hundred forty-five thousand, five hundred forty".