28078972 has 12 divisors (see below), whose sum is σ = 49497840. Its totient is φ = 13936736.

The previous prime is 28078943. The next prime is 28078987. The reversal of 28078972 is 27987082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25072 + ... + 26167.

It is an arithmetic number, because the mean of its divisors is an integer number (4124820).

Almost surely, 2^28078972 is an apocalyptic number.

It is an amenable number.

28078972 is a deficient number, since it is larger than the sum of its proper divisors (21418868).

28078972 is a wasteful number, since it uses less digits than its factorization.

28078972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51380 (or 51378 counting only the distinct ones).

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

The square root of 28078972 is about 5298.9595205097. The cubic root of 28078972 is about 303.9441119560.

The spelling of 28078972 in words is "twenty-eight million, seventy-eight thousand, nine hundred seventy-two".