28978072 has 8 divisors (see below), whose sum is σ = 54333900. Its totient is φ = 14489032.

The previous prime is 28978003. The next prime is 28978073. The reversal of 28978072 is 27087982.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28978073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1811122 + ... + 1811137.

Almost surely, 2^28978072 is an apocalyptic number.

It is an amenable number.

28978072 is a deficient number, since it is larger than the sum of its proper divisors (25355828).

28978072 is a wasteful number, since it uses less digits than its factorization.

28978072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622265 (or 3622261 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28978072 is about 5383.1284584338. The cubic root of 28978072 is about 307.1542265332.

The spelling of 28978072 in words is "twenty-eight million, nine hundred seventy-eight thousand, seventy-two".