28499919 has 12 divisors (see below), whose sum is σ = 44204184. Its totient is φ = 16285584.

The previous prime is 28499917. The next prime is 28499929. The reversal of 28499919 is 91999482.

It is a happy number.

It is not a de Polignac number, because 28499919 - 2¹ = 28499917 is a prime.

It is a super-2 number, since 2×28499919² = 1624490766013122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28499917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96792 + ... + 97085.

It is an arithmetic number, because the mean of its divisors is an integer number (3683682).

Almost surely, 2^28499919 is an apocalyptic number.

28499919 is a deficient number, since it is larger than the sum of its proper divisors (15704265).

28499919 is a wasteful number, since it uses less digits than its factorization.

28499919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193894 (or 193887 counting only the distinct ones).

The product of its digits is 419904, while the sum is 51.

The square root of 28499919 is about 5338.5315396652. The cubic root of 28499919 is about 305.4554478351.

The spelling of 28499919 in words is "twenty-eight million, four hundred ninety-nine thousand, nine hundred nineteen".