1228805550 has 72 divisors (see below), whose sum is σ = 3773027856. Its totient is φ = 280869120.

The previous prime is 1228805531. The next prime is 1228805551. The reversal of 1228805550 is 555088221.

1228805550 is a `hidden beast` number, since 1 + 2 + 28 + 80 + 5 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228805551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 191899 + ... + 198198.

Almost surely, 2^1228805550 is an apocalyptic number.

1228805550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1228805550 is an abundant number, since it is smaller than the sum of its proper divisors (2544222306).

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

1228805550 is a wasteful number, since it uses less digits than its factorization.

1228805550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390122 (or 390114 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 1228805550 is about 35054.3228432671. The cubic root of 1228805550 is about 1071.0943326954.

The spelling of 1228805550 in words is "one billion, two hundred twenty-eight million, eight hundred five thousand, five hundred fifty".