28775545 has 8 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 22977840.

The previous prime is 28775521. The next prime is 28775573. The reversal of 28775545 is 54557782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28775545 - 2¹¹ = 28773497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (4324320).

Almost surely, 2^28775545 is an apocalyptic number.

It is an amenable number.

28775545 is a deficient number, since it is larger than the sum of its proper divisors (5819015).

28775545 is a wasteful number, since it uses less digits than its factorization.

28775545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655.

The product of its digits is 392000, while the sum is 43.

The square root of 28775545 is about 5364.2842020161. The cubic root of 28775545 is about 306.4369886799.

The spelling of 28775545 in words is "twenty-eight million, seven hundred seventy-five thousand, five hundred forty-five".