28455819 has 12 divisors (see below), whose sum is σ = 44135784. Its totient is φ = 16260384.

The previous prime is 28455743. The next prime is 28455839. The reversal of 28455819 is 91855482.

It is a happy number.

It is not a de Polignac number, because 28455819 - 2¹¹ = 28453771 is a prime.

It is a super-2 number, since 2×28455819² = 1619467269921522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28455839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96642 + ... + 96935.

It is an arithmetic number, because the mean of its divisors is an integer number (3677982).

Almost surely, 2^28455819 is an apocalyptic number.

28455819 is a deficient number, since it is larger than the sum of its proper divisors (15679965).

28455819 is a wasteful number, since it uses less digits than its factorization.

28455819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193594 (or 193587 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 28455819 is about 5334.3995913317. The cubic root of 28455819 is about 305.2978153492.

The spelling of 28455819 in words is "twenty-eight million, four hundred fifty-five thousand, eight hundred nineteen".