222737728 has 56 divisors (see below), whose sum is σ = 460272384. Its totient is φ = 106828800.

The previous prime is 222737717. The next prime is 222737833. The reversal of 222737728 is 827737222.

It is a happy number.

It is a super-2 number, since 2×222737728² = 99224190949203968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259476 + ... + 260332.

Almost surely, 2^222737728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222737728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230136192).

222737728 is an abundant number, since it is smaller than the sum of its proper divisors (237534656).

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

222737728 is a wasteful number, since it uses less digits than its factorization.

222737728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031 (or 1021 counting only the distinct ones).

The product of its digits is 131712, while the sum is 40.

The square root of 222737728 is about 14924.4004234676. The cubic root of 222737728 is about 606.1748706560.

The spelling of 222737728 in words is "two hundred twenty-two million, seven hundred thirty-seven thousand, seven hundred twenty-eight".