28581026 has 4 divisors (see below), whose sum is σ = 42871542. Its totient is φ = 14290512.

The previous prime is 28581023. The next prime is 28581043. The reversal of 28581026 is 62018582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24990001 + 3591025 = 4999^2 + 1895^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28580983 and 28581001.

It is not an unprimeable number, because it can be changed into a prime (28581023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7145255 + ... + 7145258.

Almost surely, 2^28581026 is an apocalyptic number.

28581026 is a deficient number, since it is larger than the sum of its proper divisors (14290516).

28581026 is a wasteful number, since it uses less digits than its factorization.

28581026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14290515.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28581026 is about 5346.1225201074. The cubic root of 28581026 is about 305.7449353289.

The spelling of 28581026 in words is "twenty-eight million, five hundred eighty-one thousand, twenty-six".