28015905 has 8 divisors (see below), whose sum is σ = 44825472. Its totient is φ = 14941808.

The previous prime is 28015843. The next prime is 28015907. The reversal of 28015905 is 50951082.

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

It is a cyclic number.

It is not a de Polignac number, because 28015905 - 2⁷ = 28015777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28015907) 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, 933849 + ... + 933878.

It is an arithmetic number, because the mean of its divisors is an integer number (5603184).

Almost surely, 2^28015905 is an apocalyptic number.

It is an amenable number.

28015905 is a deficient number, since it is larger than the sum of its proper divisors (16809567).

28015905 is a wasteful number, since it uses less digits than its factorization.

28015905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867735.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 28015905 is about 5293.0052900030. The cubic root of 28015905 is about 303.7163826705.

Adding to 28015905 its reverse (50951082), we get a palindrome (78966987).

It can be divided in two parts, 28015 and 905, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28015905 in words is "twenty-eight million, fifteen thousand, nine hundred five".