28448919 has 18 divisors (see below), whose sum is σ = 41870088. Its totient is φ = 18610200.

The previous prime is 28448911. The next prime is 28448921. The reversal of 28448919 is 91984482.

It is not a de Polignac number, because 28448919 - 2³ = 28448911 is a prime.

It is a super-2 number, since 2×28448919² = 1618681984537122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28448911) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 134724 + ... + 134934.

It is an arithmetic number, because the mean of its divisors is an integer number (2326116).

Almost surely, 2^28448919 is an apocalyptic number.

28448919 is a deficient number, since it is larger than the sum of its proper divisors (13421169).

28448919 is an equidigital number, since it uses as much as digits as its factorization.

28448919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 285 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 28448919 is about 5333.7528064206. The cubic root of 28448919 is about 305.2731370317.

The spelling of 28448919 in words is "twenty-eight million, four hundred forty-eight thousand, nine hundred nineteen".