28629505 has 8 divisors (see below), whose sum is σ = 34826472. Its totient is φ = 22589568.

The previous prime is 28629499. The next prime is 28629539. The reversal of 28629505 is 50592682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1129969 + 27499536 = 1063^2 + 5244^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28629505 - 2¹¹ = 28627457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 38854 + ... + 39583.

It is an arithmetic number, because the mean of its divisors is an integer number (4353309).

Almost surely, 2^28629505 is an apocalyptic number.

It is an amenable number.

28629505 is a deficient number, since it is larger than the sum of its proper divisors (6196967).

28629505 is an equidigital number, since it uses as much as digits as its factorization.

28629505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78515.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 28629505 is about 5350.6546328463. The cubic root of 28629505 is about 305.9177053822.

It can be divided in two parts, 286 and 29505, that added together give a cube (29791 = 31³).

The spelling of 28629505 in words is "twenty-eight million, six hundred twenty-nine thousand, five hundred five".