228788550 has 120 divisors (see below), whose sum is σ = 673289496. Its totient is φ = 57404160.

The previous prime is 228788531. The next prime is 228788561. The reversal of 228788550 is 55887822.

228788550 is a `hidden beast` number, since 2 + 28 + 78 + 8 + 550 = 666.

It is a super-2 number, since 2×228788550² = 104688401222205000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 228788496 and 228788505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 67189 + ... + 70511.

Almost surely, 2^228788550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228788550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336644748).

228788550 is an abundant number, since it is smaller than the sum of its proper divisors (444500946).

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

228788550 is a wasteful number, since it uses less digits than its factorization.

228788550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364 (or 3350 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 228788550 is about 15125.7578322542. The cubic root of 228788550 is about 611.6149538735.

The spelling of 228788550 in words is "two hundred twenty-eight million, seven hundred eighty-eight thousand, five hundred fifty".