28620005 has 4 divisors (see below), whose sum is σ = 34344012. Its totient is φ = 22896000.

The previous prime is 28619957. The next prime is 28620017. The reversal of 28620005 is 50002682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50002682 = 2 ⋅25001341.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 13300609 = 3914^2 + 3647^2 .

It is not a de Polignac number, because 28620005 - 2¹⁶ = 28554469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2861996 + ... + 2862005.

It is an arithmetic number, because the mean of its divisors is an integer number (8586003).

Almost surely, 2^28620005 is an apocalyptic number.

It is an amenable number.

28620005 is a deficient number, since it is larger than the sum of its proper divisors (5724007).

28620005 is an equidigital number, since it uses as much as digits as its factorization.

28620005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724006.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28620005 is about 5349.7668173482. The cubic root of 28620005 is about 305.8838645396.

Adding to 28620005 its reverse (50002682), we get a palindrome (78622687).

The spelling of 28620005 in words is "twenty-eight million, six hundred twenty thousand, five".