28742985 has 32 divisors (see below), whose sum is σ = 53326080. Its totient is φ = 14661504.

The previous prime is 28742977. The next prime is 28743037. The reversal of 28742985 is 58924782.

It is not a de Polignac number, because 28742985 - 2³ = 28742977 is a prime.

It is a super-3 number, since 3×28742985³ (a number of 23 digits) contains 333 as substring.

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 28742985.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1524 + ... + 7733.

It is an arithmetic number, because the mean of its divisors is an integer number (1666440).

Almost surely, 2^28742985 is an apocalyptic number.

It is an amenable number.

28742985 is a deficient number, since it is larger than the sum of its proper divisors (24583095).

28742985 is a wasteful number, since it uses less digits than its factorization.

28742985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9294 (or 9288 counting only the distinct ones).

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

The square root of 28742985 is about 5361.2484553507. The cubic root of 28742985 is about 306.3213655702.

The spelling of 28742985 in words is "twenty-eight million, seven hundred forty-two thousand, nine hundred eighty-five".