28014451643 has 4 divisors (see below), whose sum is σ = 28147221768. Its totient is φ = 27881681520.

The previous prime is 28014451639. The next prime is 28014451723. The reversal of 28014451643 is 34615441082.

It is a happy number.

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 28014451643 - 2² = 28014451639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28014451597 and 28014451606.

It is not an unprimeable number, because it can be changed into a prime (28014451243) 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, 66384746 + ... + 66385167.

It is an arithmetic number, because the mean of its divisors is an integer number (7036805442).

Almost surely, 2^28014451643 is an apocalyptic number.

28014451643 is a deficient number, since it is larger than the sum of its proper divisors (132770125).

28014451643 is a wasteful number, since it uses less digits than its factorization.

28014451643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132770124.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 28014451643 in words is "twenty-eight billion, fourteen million, four hundred fifty-one thousand, six hundred forty-three".