28580786 has 8 divisors (see below), whose sum is σ = 46169004. Its totient is φ = 13191120.

The previous prime is 28580771. The next prime is 28580819. The reversal of 28580786 is 68708582.

It can be written as a sum of positive squares in 2 ways, for example, as 27825625 + 755161 = 5275^2 + 869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28580786² = 1633722656755592, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 549605 + ... + 549656.

Almost surely, 2^28580786 is an apocalyptic number.

28580786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28580786 is a deficient number, since it is larger than the sum of its proper divisors (17588218).

28580786 is a wasteful number, since it uses less digits than its factorization.

28580786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099276.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 28580786 is about 5346.1000738856. The cubic root of 28580786 is about 305.7440795281.

The spelling of 28580786 in words is "twenty-eight million, five hundred eighty thousand, seven hundred eighty-six".