28487235949 has 4 divisors (see below), whose sum is σ = 29469554460. Its totient is φ = 27504917440.

The previous prime is 28487235943. The next prime is 28487235979. The reversal of 28487235949 is 94953278482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94953278482 = 2 ⋅47476639241.

It can be written as a sum of positive squares in 2 ways, for example, as 6728920900 + 21758315049 = 82030^2 + 147507^2 .

It is a cyclic number.

It is not a de Polignac number, because 28487235949 - 2⁹ = 28487235437 is a prime.

It is a super-2 number, since 2×28487235949² (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 (28487235943) 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, 491159212 + ... + 491159269.

It is an arithmetic number, because the mean of its divisors is an integer number (7367388615).

Almost surely, 2^28487235949 is an apocalyptic number.

28487235949 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28487235949 is a deficient number, since it is larger than the sum of its proper divisors (982318511).

28487235949 is an equidigital number, since it uses as much as digits as its factorization.

28487235949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982318510.

The product of its digits is 34836480, while the sum is 61.

The spelling of 28487235949 in words is "twenty-eight billion, four hundred eighty-seven million, two hundred thirty-five thousand, nine hundred forty-nine".