28738930 has 32 divisors (see below), whose sum is σ = 57371328. Its totient is φ = 10276800.

The previous prime is 28738889. The next prime is 28738939. The reversal of 28738930 is 3983782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28738939) 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 in 15 ways as a sum of consecutive naturals, for example, 4569 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (1792854).

Almost surely, 2^28738930 is an apocalyptic number.

28738930 is a deficient number, since it is larger than the sum of its proper divisors (28632398).

28738930 is a wasteful number, since it uses less digits than its factorization.

28738930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28738930 is about 5360.8702651715. The cubic root of 28738930 is about 306.3069598343.

The spelling of 28738930 in words is "twenty-eight million, seven hundred thirty-eight thousand, nine hundred thirty".