28405019 has 8 divisors (see below), whose sum is σ = 30408000. Its totient is φ = 26452872.

The previous prime is 28405001. The next prime is 28405037. The reversal of 28405019 is 91050482.

28405019 is nontrivially palindromic in base 2.

It is an interprime number because it is at equal distance from previous prime (28405001) and next prime (28405037).

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 28405019 - 2⁸ = 28404763 is a prime.

It is a super-2 number, since 2×28405019² = 1613690208780722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28404982 and 28405000.

It is not an unprimeable number, because it can be changed into a prime (28405099) 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, 11549 + ... + 13790.

It is an arithmetic number, because the mean of its divisors is an integer number (3801000).

Almost surely, 2^28405019 is an apocalyptic number.

28405019 is a deficient number, since it is larger than the sum of its proper divisors (2002981).

28405019 is a wasteful number, since it uses less digits than its factorization.

28405019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25417.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28405019 is about 5329.6359162705. The cubic root of 28405019 is about 305.1160321755.

The spelling of 28405019 in words is "twenty-eight million, four hundred five thousand, nineteen".