28978730 has 16 divisors (see below), whose sum is σ = 56903904. Its totient is φ = 10537680.

The previous prime is 28978723. The next prime is 28978739. The reversal of 28978730 is 3787982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28978739) 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 7 ways as a sum of consecutive naturals, for example, 131612 + ... + 131831.

It is an arithmetic number, because the mean of its divisors is an integer number (3556494).

Almost surely, 2^28978730 is an apocalyptic number.

28978730 is a deficient number, since it is larger than the sum of its proper divisors (27925174).

28978730 is a wasteful number, since it uses less digits than its factorization.

28978730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263461.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 28978730 is about 5383.1895749639. The cubic root of 28978730 is about 307.1565513480.

The spelling of 28978730 in words is "twenty-eight million, nine hundred seventy-eight thousand, seven hundred thirty".