28772516 has 12 divisors (see below), whose sum is σ = 50395632. Its totient is φ = 14373768.

The previous prime is 28772503. The next prime is 28772519. The reversal of 28772516 is 61527782.

It is a self number, because there is not a number n which added to its sum of digits gives 28772516.

It is not an unprimeable number, because it can be changed into a prime (28772519) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3731 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (4199636).

Almost surely, 2^28772516 is an apocalyptic number.

It is an amenable number.

28772516 is a deficient number, since it is larger than the sum of its proper divisors (21623116).

28772516 is a wasteful number, since it uses less digits than its factorization.

28772516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6250 (or 6248 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 28772516 is about 5364.0018642801. The cubic root of 28772516 is about 306.4262361444.

The spelling of 28772516 in words is "twenty-eight million, seven hundred seventy-two thousand, five hundred sixteen".