28920830 has 32 divisors (see below), whose sum is σ = 55607040. Its totient is φ = 10805760.

The previous prime is 28920809. The next prime is 28920833. The reversal of 28920830 is 3802982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28920833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7382 + ... + 10598.

It is an arithmetic number, because the mean of its divisors is an integer number (1737720).

Almost surely, 2^28920830 is an apocalyptic number.

28920830 is a deficient number, since it is larger than the sum of its proper divisors (26686210).

28920830 is a wasteful number, since it uses less digits than its factorization.

28920830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28920830 is about 5377.8090334262. The cubic root of 28920830 is about 306.9518469323.

The spelling of 28920830 in words is "twenty-eight million, nine hundred twenty thousand, eight hundred thirty".