28378508 has 12 divisors (see below), whose sum is σ = 52583832. Its totient is φ = 13354560.

The previous prime is 28378507. The next prime is 28378523. The reversal of 28378508 is 80587382.

It is not an unprimeable number, because it can be changed into a prime (28378507) 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, 208598 + ... + 208733.

It is an arithmetic number, because the mean of its divisors is an integer number (4381986).

Almost surely, 2^28378508 is an apocalyptic number.

It is an amenable number.

28378508 is a deficient number, since it is larger than the sum of its proper divisors (24205324).

28378508 is a wasteful number, since it uses less digits than its factorization.

28378508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417352 (or 417350 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 28378508 is about 5327.1482051845. The cubic root of 28378508 is about 305.0210788979.

The spelling of 28378508 in words is "twenty-eight million, three hundred seventy-eight thousand, five hundred eight".