28888705 has 8 divisors (see below), whose sum is σ = 34700904. Its totient is φ = 23088000.

The previous prime is 28888681. The next prime is 28888747. The reversal of 28888705 is 50788882.

It can be written as a sum of positive squares in 4 ways, for example, as 341056 + 28547649 = 584^2 + 5343^2 .

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

It is not a de Polignac number, because 28888705 - 2⁷ = 28888577 is a prime.

It is a Duffinian number.

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, 4285 + ... + 8725.

It is an arithmetic number, because the mean of its divisors is an integer number (4337613).

Almost surely, 2^28888705 is an apocalyptic number.

It is an amenable number.

28888705 is a deficient number, since it is larger than the sum of its proper divisors (5812199).

28888705 is a wasteful number, since it uses less digits than its factorization.

28888705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747.

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 28888705 is about 5374.8213923813. The cubic root of 28888705 is about 306.8381517002.

The spelling of 28888705 in words is "twenty-eight million, eight hundred eighty-eight thousand, seven hundred five".