28972485 has 20 divisors (see below), whose sum is σ = 51936588. Its totient is φ = 15451776.

The previous prime is 28972453. The next prime is 28972487. The reversal of 28972485 is 58427982.

It can be written as a sum of positive squares in 2 ways, for example, as 10850436 + 18122049 = 3294^2 + 4257^2 .

It is not a de Polignac number, because 28972485 - 2⁵ = 28972453 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 28972485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28972487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35364 + ... + 36173.

Almost surely, 2^28972485 is an apocalyptic number.

It is an amenable number.

28972485 is a deficient number, since it is larger than the sum of its proper divisors (22964103).

28972485 is an equidigital number, since it uses as much as digits as its factorization.

28972485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71554 (or 71545 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 28972485 is about 5382.6094972606. The cubic root of 28972485 is about 307.1344853882.

The spelling of 28972485 in words is "twenty-eight million, nine hundred seventy-two thousand, four hundred eighty-five".