28891485 has 96 divisors (see below), whose sum is σ = 61501440. Its totient is φ = 12737088.

The previous prime is 28891481. The next prime is 28891493. The reversal of 28891485 is 58419882.

It is a happy number.

28891485 is a `hidden beast` number, since 2 + 88 + 91 + 485 = 666.

It is not a de Polignac number, because 28891485 - 2² = 28891481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28891485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891481) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 365676 + ... + 365754.

It is an arithmetic number, because the mean of its divisors is an integer number (640640).

Almost surely, 2^28891485 is an apocalyptic number.

It is an amenable number.

28891485 is an abundant number, since it is smaller than the sum of its proper divisors (32609955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28891485 is an equidigital number, since it uses as much as digits as its factorization.

28891485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 137 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28891485 is about 5375.0799994047. The cubic root of 28891485 is about 306.8479938709.

The spelling of 28891485 in words is "twenty-eight million, eight hundred ninety-one thousand, four hundred eighty-five".