28540605 has 16 divisors (see below), whose sum is σ = 46728000. Its totient is φ = 14867328.

The previous prime is 28540573. The next prime is 28540607. The reversal of 28540605 is 50604582.

It is not a de Polignac number, because 28540605 - 2⁵ = 28540573 is a prime.

It is a super-2 number, since 2×28540605² = 1629132267532050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21480 + ... + 22769.

It is an arithmetic number, because the mean of its divisors is an integer number (2920500).

Almost surely, 2^28540605 is an apocalyptic number.

It is an amenable number.

28540605 is a deficient number, since it is larger than the sum of its proper divisors (18187395).

28540605 is a wasteful number, since it uses less digits than its factorization.

28540605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44300.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 28540605 is about 5342.3407790967. The cubic root of 28540605 is about 305.6007330568.

The spelling of 28540605 in words is "twenty-eight million, five hundred forty thousand, six hundred five".