28730026 has 16 divisors (see below), whose sum is σ = 47048904. Its totient is φ = 13077504.

The previous prime is 28730021. The next prime is 28730047. The reversal of 28730026 is 62003782.

It can be written as a sum of positive squares in 4 ways, for example, as 22099401 + 6630625 = 4701^2 + 2575^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28729976 and 28730003.

It is not an unprimeable number, because it can be changed into a prime (28730021) 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, 5671 + ... + 9466.

Almost surely, 2^28730026 is an apocalyptic number.

28730026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28730026 is a deficient number, since it is larger than the sum of its proper divisors (18318878).

28730026 is a wasteful number, since it uses less digits than its factorization.

28730026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15225.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 28730026 is about 5360.0397386587. The cubic root of 28730026 is about 306.2753228540.

The spelling of 28730026 in words is "twenty-eight million, seven hundred thirty thousand, twenty-six".