28919005 has 8 divisors (see below), whose sum is σ = 35510112. Its totient is φ = 22597008.

The previous prime is 28918993. The next prime is 28919017. The reversal of 28919005 is 50091982.

It is an interprime number because it is at equal distance from previous prime (28918993) and next prime (28919017).

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

It is a cyclic number.

It is not a de Polignac number, because 28919005 - 2⁹ = 28918493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67039 + ... + 67468.

It is an arithmetic number, because the mean of its divisors is an integer number (4438764).

Almost surely, 2^28919005 is an apocalyptic number.

It is an amenable number.

28919005 is a deficient number, since it is larger than the sum of its proper divisors (6591107).

28919005 is a wasteful number, since it uses less digits than its factorization.

28919005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134555.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 28919005 is about 5377.6393519834. The cubic root of 28919005 is about 306.9453902377.

The spelling of 28919005 in words is "twenty-eight million, nine hundred nineteen thousand, five".