28378456 has 8 divisors (see below), whose sum is σ = 53209620. Its totient is φ = 14189224.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378456 is 65487382.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1773646 + ... + 1773661.

Almost surely, 2^28378456 is an apocalyptic number.

It is an amenable number.

28378456 is a deficient number, since it is larger than the sum of its proper divisors (24831164).

28378456 is a wasteful number, since it uses less digits than its factorization.

28378456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547313 (or 3547309 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 28378456 is about 5327.1433245221. The cubic root of 28378456 is about 305.0208925937.

The spelling of 28378456 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred fifty-six".