28500019 has 8 divisors (see below), whose sum is σ = 30065040. Its totient is φ = 26941536.

The previous prime is 28499971. The next prime is 28500023. The reversal of 28500019 is 91000582.

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 28500019 - 2¹⁵ = 28467251 is a prime.

It is a super-2 number, since 2×28500019² = 1624502166000722, 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 = 28499966 and 28500002.

It is not an unprimeable number, because it can be changed into a prime (28500029) 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, 9237 + ... + 11929.

It is an arithmetic number, because the mean of its divisors is an integer number (3758130).

Almost surely, 2^28500019 is an apocalyptic number.

28500019 is a deficient number, since it is larger than the sum of its proper divisors (1565021).

28500019 is a wasteful number, since it uses less digits than its factorization.

28500019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 28500019 is about 5338.5409055284. The cubic root of 28500019 is about 305.4558050935.

The spelling of 28500019 in words is "twenty-eight million, five hundred thousand, nineteen".