1428771769 has 4 divisors (see below), whose sum is σ = 1428887844. Its totient is φ = 1428655696.

The previous prime is 1428771763. The next prime is 1428771779. The reversal of 1428771769 is 9671778241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9671778241 = 59621 ⋅162221.

It can be written as a sum of positive squares in 2 ways, for example, as 993006144 + 435765625 = 31512^2 + 20875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428771769 - 2¹⁹ = 1428247481 is a prime.

It is a super-2 number, since 2×1428771769² = 4082777535782778722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428771763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37042 + ... + 65035.

It is an arithmetic number, because the mean of its divisors is an integer number (357221961).

Almost surely, 2^1428771769 is an apocalyptic number.

It is an amenable number.

1428771769 is a deficient number, since it is larger than the sum of its proper divisors (116075).

1428771769 is a wasteful number, since it uses less digits than its factorization.

1428771769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116074.

The product of its digits is 1185408, while the sum is 52.

The square root of 1428771769 is about 37799.0974627702. The cubic root of 1428771769 is about 1126.3005256788.

The spelling of 1428771769 in words is "one billion, four hundred twenty-eight million, seven hundred seventy-one thousand, seven hundred sixty-nine".