28706649 has 16 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 18763920.

The previous prime is 28706641. The next prime is 28706653. The reversal of 28706649 is 94660782.

It is not a de Polignac number, because 28706649 - 2³ = 28706641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28706649.

It is not an unprimeable number, because it can be changed into a prime (28706641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65172 + ... + 65610.

It is an arithmetic number, because the mean of its divisors is an integer number (2439360).

Almost surely, 2^28706649 is an apocalyptic number.

It is an amenable number.

28706649 is a deficient number, since it is larger than the sum of its proper divisors (10323111).

28706649 is a wasteful number, since it uses less digits than its factorization.

28706649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 28706649 is about 5357.8586207551. The cubic root of 28706649 is about 306.1922304472.

The spelling of 28706649 in words is "twenty-eight million, seven hundred six thousand, six hundred forty-nine".