28378619 has 8 divisors (see below), whose sum is σ = 29676192. Its totient is φ = 27086400.

The previous prime is 28378607. The next prime is 28378631. The reversal of 28378619 is 91687382.

It is an interprime number because it is at equal distance from previous prime (28378607) and next prime (28378631).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28378619 is a prime.

It is a super-2 number, since 2×28378619² = 1610692032694322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28378619.

It is not an unprimeable number, because it can be changed into a prime (28378639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12797 + ... + 14849.

It is an arithmetic number, because the mean of its divisors is an integer number (3709524).

Almost surely, 2^28378619 is an apocalyptic number.

28378619 is a deficient number, since it is larger than the sum of its proper divisors (1297573).

28378619 is a wasteful number, since it uses less digits than its factorization.

28378619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677.

The product of its digits is 145152, while the sum is 44.

The square root of 28378619 is about 5327.1586235065. The cubic root of 28378619 is about 305.0214765850.

The spelling of 28378619 in words is "twenty-eight million, three hundred seventy-eight thousand, six hundred nineteen".