28919045 has 8 divisors (see below), whose sum is σ = 36529440. Its totient is φ = 21917520.

The previous prime is 28919039. The next prime is 28919047. The reversal of 28919045 is 54091982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28919045 - 2¹⁶ = 28853509 is a prime.

It is a super-2 number, since 2×28919045² = 1672622327424050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28919047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152111 + ... + 152300.

It is an arithmetic number, because the mean of its divisors is an integer number (4566180).

Almost surely, 2^28919045 is an apocalyptic number.

It is an amenable number.

28919045 is a deficient number, since it is larger than the sum of its proper divisors (7610395).

28919045 is a wasteful number, since it uses less digits than its factorization.

28919045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304435.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 28919045 is about 5377.6430710861. The cubic root of 28919045 is about 306.9455317572.

The spelling of 28919045 in words is "twenty-eight million, nine hundred nineteen thousand, forty-five".