28734885 has 16 divisors (see below), whose sum is σ = 51084480. Its totient is φ = 15325200.

The previous prime is 28734869. The next prime is 28734887. The reversal of 28734885 is 58843782.

It is not a de Polignac number, because 28734885 - 2⁴ = 28734869 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28734885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28734887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106291 + ... + 106560.

It is an arithmetic number, because the mean of its divisors is an integer number (3192780).

Almost surely, 2^28734885 is an apocalyptic number.

It is an amenable number.

28734885 is a deficient number, since it is larger than the sum of its proper divisors (22349595).

28734885 is a wasteful number, since it uses less digits than its factorization.

28734885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212865 (or 212859 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 28734885 is about 5360.4929810606. The cubic root of 28734885 is about 306.2925882741.

The spelling of 28734885 in words is "twenty-eight million, seven hundred thirty-four thousand, eight hundred eighty-five".