1428644435723 has 4 divisors (see below), whose sum is σ = 1455599991168. Its totient is φ = 1401688880280.

The previous prime is 1428644435689. The next prime is 1428644435731. The reversal of 1428644435723 is 3275344468241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1428644435723 - 2¹⁴ = 1428644419339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 26955555391 = 1428644435723 / (1 + 4 + 2 + 8 + 6 + 4 + 4 + 4 + 3 + 5 + 7 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428644435753) 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, 13477777643 + ... + 13477777748.

It is an arithmetic number, because the mean of its divisors is an integer number (363899997792).

Almost surely, 2^{1428644435723} is an apocalyptic number.

1428644435723 is a deficient number, since it is larger than the sum of its proper divisors (26955555445).

1428644435723 is an equidigital number, since it uses as much as digits as its factorization.

1428644435723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26955555444.

The product of its digits is 15482880, while the sum is 53.

The spelling of 1428644435723 in words is "one trillion, four hundred twenty-eight billion, six hundred forty-four million, four hundred thirty-five thousand, seven hundred twenty-three".