1428642865 has 8 divisors (see below), whose sum is σ = 1846246248. Its totient is φ = 1054997760.

The previous prime is 1428642829. The next prime is 1428642893. The reversal of 1428642865 is 5682468241.

It can be written as a sum of positive squares in 4 ways, for example, as 35188624 + 1393454241 = 5932^2 + 37329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1428642865 - 2¹¹ = 1428640817 is a prime.

It is a Duffinian 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, 10989496 + ... + 10989625.

It is an arithmetic number, because the mean of its divisors is an integer number (230780781).

Almost surely, 2^1428642865 is an apocalyptic number.

It is an amenable number.

1428642865 is a deficient number, since it is larger than the sum of its proper divisors (417603383).

1428642865 is a wasteful number, since it uses less digits than its factorization.

1428642865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21979139.

The product of its digits is 737280, while the sum is 46.

The square root of 1428642865 is about 37797.3923042318. The cubic root of 1428642865 is about 1126.2666529935.

The spelling of 1428642865 in words is "one billion, four hundred twenty-eight million, six hundred forty-two thousand, eight hundred sixty-five".