1284478550 has 12 divisors (see below), whose sum is σ = 2389130196. Its totient is φ = 513791400.

The previous prime is 1284478543. The next prime is 1284478553. The reversal of 1284478550 is 558744821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284478553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12844736 + ... + 12844835.

It is an arithmetic number, because the mean of its divisors is an integer number (199094183).

Almost surely, 2^1284478550 is an apocalyptic number.

1284478550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1284478550 is a deficient number, since it is larger than the sum of its proper divisors (1104651646).

1284478550 is a wasteful number, since it uses less digits than its factorization.

1284478550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25689583 (or 25689578 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 44.

The square root of 1284478550 is about 35839.6226263615. The cubic root of 1284478550 is about 1087.0318908399.

The spelling of 1284478550 in words is "one billion, two hundred eighty-four million, four hundred seventy-eight thousand, five hundred fifty".