28928419 has 4 divisors (see below), whose sum is σ = 31153696. Its totient is φ = 26703144.

The previous prime is 28928371. The next prime is 28928423. The reversal of 28928419 is 91482982.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-28928419 is a prime.

It is a super-2 number, since 2×28928419² = 1673706851679122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28928479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112619 + ... + 1112644.

It is an arithmetic number, because the mean of its divisors is an integer number (7788424).

Almost surely, 2^28928419 is an apocalyptic number.

28928419 is a deficient number, since it is larger than the sum of its proper divisors (2225277).

28928419 is a wasteful number, since it uses less digits than its factorization.

28928419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225276.

The product of its digits is 82944, while the sum is 43.

The square root of 28928419 is about 5378.5145718869. The cubic root of 28928419 is about 306.9786932554.

It can be divided in two parts, 2892 and 8419, that added together give a palindrome (11311).

The spelling of 28928419 in words is "twenty-eight million, nine hundred twenty-eight thousand, four hundred nineteen".