1428128205 has 16 divisors (see below), whose sum is σ = 2611434624. Its totient is φ = 652858560.

The previous prime is 1428128203. The next prime is 1428128227. The reversal of 1428128205 is 5028218241.

It is not a de Polignac number, because 1428128205 - 2¹ = 1428128203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428128203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6800506 + ... + 6800715.

It is an arithmetic number, because the mean of its divisors is an integer number (163214664).

Almost surely, 2^1428128205 is an apocalyptic number.

1428128205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1428128205 is a deficient number, since it is larger than the sum of its proper divisors (1183306419).

1428128205 is a wasteful number, since it uses less digits than its factorization.

1428128205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13601236.

The product of its (nonzero) digits is 10240, while the sum is 33.

The square root of 1428128205 is about 37790.5835493447. The cubic root of 1428128205 is about 1126.1313931540.

It can be divided in two parts, 14281 and 28205, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 1428128205 in words is "one billion, four hundred twenty-eight million, one hundred twenty-eight thousand, two hundred five".