28972390 has 16 divisors (see below), whose sum is σ = 52639632. Its totient is φ = 11480224.

The previous prime is 28972379. The next prime is 28972417. The reversal of 28972390 is 9327982.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 12469 + ... + 14608.

It is an arithmetic number, because the mean of its divisors is an integer number (3289977).

Almost surely, 2^28972390 is an apocalyptic number.

28972390 is a deficient number, since it is larger than the sum of its proper divisors (23667242).

28972390 is a wasteful number, since it uses less digits than its factorization.

28972390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27191.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 28972390 is about 5382.6006725374. The cubic root of 28972390 is about 307.1341496926.

The spelling of 28972390 in words is "twenty-eight million, nine hundred seventy-two thousand, three hundred ninety".