28513019 has 8 divisors (see below), whose sum is σ = 28980000. Its totient is φ = 28049472.

The previous prime is 28513013. The next prime is 28513021. The reversal of 28513019 is 91031582.

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 28513019 - 2⁸ = 28512763 is a prime.

It is a super-2 number, since 2×28513019² = 1625984504988722, 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 = 28512982 and 28513000.

It is not an unprimeable number, because it can be changed into a prime (28513013) 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, 19682 + ... + 21080.

It is an arithmetic number, because the mean of its divisors is an integer number (3622500).

Almost surely, 2^28513019 is an apocalyptic number.

28513019 is a deficient number, since it is larger than the sum of its proper divisors (466981).

28513019 is a wasteful number, since it uses less digits than its factorization.

28513019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 28513019 is about 5339.7583278647. The cubic root of 28513019 is about 305.5022415755.

The spelling of 28513019 in words is "twenty-eight million, five hundred thirteen thousand, nineteen".