28891587249 has 48 divisors (see below), whose sum is σ = 49240813440. Its totient is φ = 16400400480.

The previous prime is 28891587247. The next prime is 28891587253. The reversal of 28891587249 is 94278519882.

28891587249 is a `hidden beast` number, since 2 + 8 + 8 + 9 + 1 + 587 + 2 + 49 = 666.

It is not a de Polignac number, because 28891587249 - 2¹ = 28891587247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28891587247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31437612 + ... + 31438530.

It is an arithmetic number, because the mean of its divisors is an integer number (1025850280).

Almost surely, 2^28891587249 is an apocalyptic number.

It is an amenable number.

28891587249 is a deficient number, since it is larger than the sum of its proper divisors (20349226191).

28891587249 is an frugal number, since it uses more digits than its factorization.

28891587249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 1110 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 28891587249 in words is "twenty-eight billion, eight hundred ninety-one million, five hundred eighty-seven thousand, two hundred forty-nine".