28009545 has 8 divisors (see below), whose sum is σ = 44815296. Its totient is φ = 14938416.

The previous prime is 28009543. The next prime is 28009549. The reversal of 28009545 is 54590082.

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

It is not a de Polignac number, because 28009545 - 2¹ = 28009543 is a prime.

It is a super-2 number, since 2×28009545² = 1569069222214050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28009543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 933637 + ... + 933666.

It is an arithmetic number, because the mean of its divisors is an integer number (5601912).

Almost surely, 2^28009545 is an apocalyptic number.

It is an amenable number.

28009545 is a deficient number, since it is larger than the sum of its proper divisors (16805751).

28009545 is a wasteful number, since it uses less digits than its factorization.

28009545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867311.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 28009545 is about 5292.4044630017. The cubic root of 28009545 is about 303.6933983172.

The spelling of 28009545 in words is "twenty-eight million, nine thousand, five hundred forty-five".