28478528669 has 4 divisors (see below), whose sum is σ = 28485018720. Its totient is φ = 28472038620.

The previous prime is 28478528657. The next prime is 28478528717. The reversal of 28478528669 is 96682587482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28478528669 - 2¹⁶ = 28478463133 is a prime.

It is a super-2 number, since 2×28478528669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28478548669) 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, 3238439 + ... + 3247220.

It is an arithmetic number, because the mean of its divisors is an integer number (7121254680).

Almost surely, 2^28478528669 is an apocalyptic number.

It is an amenable number.

28478528669 is a deficient number, since it is larger than the sum of its proper divisors (6490051).

28478528669 is an equidigital number, since it uses as much as digits as its factorization.

28478528669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490050.

The product of its digits is 92897280, while the sum is 65.

The spelling of 28478528669 in words is "twenty-eight billion, four hundred seventy-eight million, five hundred twenty-eight thousand, six hundred sixty-nine".