1428723021658 has 8 divisors (see below), whose sum is σ = 2236262120928. Its totient is φ = 683302314684.

The previous prime is 1428723021653. The next prime is 1428723021659. The reversal of 1428723021658 is 8561203278241.

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

It is not an unprimeable number, because it can be changed into a prime (1428723021653) 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, 15529598016 + ... + 15529598107.

It is an arithmetic number, because the mean of its divisors is an integer number (279532765116).

Almost surely, 2^{1428723021658} is an apocalyptic number.

1428723021658 is a deficient number, since it is larger than the sum of its proper divisors (807539099270).

1428723021658 is a wasteful number, since it uses less digits than its factorization.

1428723021658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31059196148.

The product of its (nonzero) digits is 1290240, while the sum is 49.

Adding to 1428723021658 its reverse (8561203278241), we get a palindrome (9989926299899).

The spelling of 1428723021658 in words is "one trillion, four hundred twenty-eight billion, seven hundred twenty-three million, twenty-one thousand, six hundred fifty-eight".