28041405 has 32 divisors (see below), whose sum is σ = 53049600. Its totient is φ = 12375552.

The previous prime is 28041401. The next prime is 28041407. The reversal of 28041405 is 50414082.

It is not a de Polignac number, because 28041405 - 2² = 28041401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28041401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1560 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (1657800).

Almost surely, 2^28041405 is an apocalyptic number.

It is an amenable number.

28041405 is a deficient number, since it is larger than the sum of its proper divisors (25008195).

28041405 is a wasteful number, since it uses less digits than its factorization.

28041405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28041405 is about 5295.4135815817. The cubic root of 28041405 is about 303.8085020005.

Adding to 28041405 its reverse (50414082), we get a palindrome (78455487).

The spelling of 28041405 in words is "twenty-eight million, forty-one thousand, four hundred five".