28987945169 has 4 divisors (see below), whose sum is σ = 28988434800. Its totient is φ = 28987455540.

The previous prime is 28987945153. The next prime is 28987945171. The reversal of 28987945169 is 96154978982.

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 28987945169 - 2⁴ = 28987945153 is a prime.

It is a super-2 number, since 2×28987945169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28987945099 and 28987945108.

It is not an unprimeable number, because it can be changed into a prime (28987945139) 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, 141467 + ... + 279264.

It is an arithmetic number, because the mean of its divisors is an integer number (7247108700).

Almost surely, 2^28987945169 is an apocalyptic number.

It is an amenable number.

28987945169 is a deficient number, since it is larger than the sum of its proper divisors (489631).

28987945169 is an equidigital number, since it uses as much as digits as its factorization.

28987945169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489630.

The product of its digits is 78382080, while the sum is 68.

The spelling of 28987945169 in words is "twenty-eight billion, nine hundred eighty-seven million, nine hundred forty-five thousand, one hundred sixty-nine".