28078388 has 24 divisors (see below), whose sum is σ = 53061120. Its totient is φ = 12924000.

The previous prime is 28078387. The next prime is 28078397. The reversal of 28078388 is 88387082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078381) 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, 37013 + ... + 37763.

It is an arithmetic number, because the mean of its divisors is an integer number (2210880).

Almost surely, 2^28078388 is an apocalyptic number.

It is an amenable number.

28078388 is a deficient number, since it is larger than the sum of its proper divisors (24982732).

28078388 is a wasteful number, since it uses less digits than its factorization.

28078388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 44.

The square root of 28078388 is about 5298.9044150654. The cubic root of 28078388 is about 303.9420047493.

The spelling of 28078388 in words is "twenty-eight million, seventy-eight thousand, three hundred eighty-eight".