28649687 has 8 divisors (see below), whose sum is σ = 31767312. Its totient is φ = 25617600.

The previous prime is 28649659. The next prime is 28649689. The reversal of 28649687 is 78694682.

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 28649687 - 2⁶ = 28649623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28649689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20678 + ... + 22019.

It is an arithmetic number, because the mean of its divisors is an integer number (3970914).

Almost surely, 2^28649687 is an apocalyptic number.

28649687 is a deficient number, since it is larger than the sum of its proper divisors (3117625).

28649687 is a wasteful number, since it uses less digits than its factorization.

28649687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42769.

The product of its digits is 1161216, while the sum is 50.

The square root of 28649687 is about 5352.5402380552. The cubic root of 28649687 is about 305.9895727434.

The spelling of 28649687 in words is "twenty-eight million, six hundred forty-nine thousand, six hundred eighty-seven".