28643025407 has 4 divisors (see below), whose sum is σ = 30150553080. Its totient is φ = 27135497736.

The previous prime is 28643025401. The next prime is 28643025421. The reversal of 28643025407 is 70452034682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70452034682 = 2 ⋅35226017341.

It is a cyclic number.

It is not a de Polignac number, because 28643025407 - 2⁶ = 28643025343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643025401) 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, 753763808 + ... + 753763845.

It is an arithmetic number, because the mean of its divisors is an integer number (7537638270).

Almost surely, 2^28643025407 is an apocalyptic number.

28643025407 is a deficient number, since it is larger than the sum of its proper divisors (1507527673).

28643025407 is a wasteful number, since it uses less digits than its factorization.

28643025407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507527672.

The product of its (nonzero) digits is 322560, while the sum is 41.

The spelling of 28643025407 in words is "twenty-eight billion, six hundred forty-three million, twenty-five thousand, four hundred seven".