28011845 has 8 divisors (see below), whose sum is σ = 33947640. Its totient is φ = 22187200.

The previous prime is 28011839. The next prime is 28011847. The reversal of 28011845 is 54811082.

It can be written as a sum of positive squares in 4 ways, for example, as 1623076 + 26388769 = 1274^2 + 5137^2 .

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

It is not a de Polignac number, because 28011845 - 2¹⁶ = 27946309 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011847) 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, 27230 + ... + 28239.

It is an arithmetic number, because the mean of its divisors is an integer number (4243455).

Almost surely, 2^28011845 is an apocalyptic number.

It is an amenable number.

28011845 is a deficient number, since it is larger than the sum of its proper divisors (5935795).

28011845 is a wasteful number, since it uses less digits than its factorization.

28011845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55575.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 28011845 is about 5292.6217510795. The cubic root of 28011845 is about 303.7017106704.

It can be divided in two parts, 280 and 11845, that multiplied together give a triangular number (3316600 = T₂₅₇₅).

The spelling of 28011845 in words is "twenty-eight million, eleven thousand, eight hundred forty-five".