28993545 has 72 divisors (see below), whose sum is σ = 60750144. Its totient is φ = 13226976.

The previous prime is 28993541. The next prime is 28993571. The reversal of 28993545 is 54539982.

It is not a de Polignac number, because 28993545 - 2² = 28993541 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 28993545.

It is not an unprimeable number, because it can be changed into a prime (28993541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 59292 + ... + 59778.

It is an arithmetic number, because the mean of its divisors is an integer number (843752).

Almost surely, 2^28993545 is an apocalyptic number.

It is an amenable number.

28993545 is an abundant number, since it is smaller than the sum of its proper divisors (31756599).

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

28993545 is an equidigital number, since it uses as much as digits as its factorization.

28993545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 502 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 28993545 is about 5384.5654420761. The cubic root of 28993545 is about 307.2088856988.

The spelling of 28993545 in words is "twenty-eight million, nine hundred ninety-three thousand, five hundred forty-five".