28857616 has 20 divisors (see below), whose sum is σ = 56023324. Its totient is φ = 14400000.

The previous prime is 28857607. The next prime is 28857623. The reversal of 28857616 is 61675882.

It can be written as a sum of positive squares in 2 ways, for example, as 20214016 + 8643600 = 4496^2 + 2940^2 .

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, 8116 + ... + 11116.

Almost surely, 2^28857616 is an apocalyptic number.

It is an amenable number.

28857616 is a deficient number, since it is larger than the sum of its proper divisors (27165708).

28857616 is a wasteful number, since it uses less digits than its factorization.

28857616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610 (or 3604 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28857616 is about 5371.9285177672. The cubic root of 28857616 is about 306.7280427459.

It can be divided in two parts, 2885 and 7616, that added together give a palindrome (10501).

The spelling of 28857616 in words is "twenty-eight million, eight hundred fifty-seven thousand, six hundred sixteen".