28648385 has 8 divisors (see below), whose sum is σ = 34408680. Its totient is φ = 22898304.

The previous prime is 28648369. The next prime is 28648439. The reversal of 28648385 is 58384682.

It can be written as a sum of positive squares in 4 ways, for example, as 1784896 + 26863489 = 1336^2 + 5183^2 .

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 28648385 - 2⁴ = 28648369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6629 + ... + 10061.

It is an arithmetic number, because the mean of its divisors is an integer number (4301085).

Almost surely, 2^28648385 is an apocalyptic number.

It is an amenable number.

28648385 is a deficient number, since it is larger than the sum of its proper divisors (5760295).

28648385 is a wasteful number, since it uses less digits than its factorization.

28648385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107.

The product of its digits is 368640, while the sum is 44.

The square root of 28648385 is about 5352.4186121790. The cubic root of 28648385 is about 305.9849373878.

The spelling of 28648385 in words is "twenty-eight million, six hundred forty-eight thousand, three hundred eighty-five".