28681465 has 16 divisors (see below), whose sum is σ = 36609408. Its totient is φ = 21496576.

The previous prime is 28681463. The next prime is 28681489. The reversal of 28681465 is 56418682.

It is a cyclic number.

It is not a de Polignac number, because 28681465 - 2¹ = 28681463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28681463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21714 + ... + 22996.

It is an arithmetic number, because the mean of its divisors is an integer number (2288088).

Almost surely, 2^28681465 is an apocalyptic number.

It is an amenable number.

28681465 is a deficient number, since it is larger than the sum of its proper divisors (7927943).

28681465 is a wasteful number, since it uses less digits than its factorization.

28681465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568.

The product of its digits is 92160, while the sum is 40.

The square root of 28681465 is about 5355.5079124206. The cubic root of 28681465 is about 306.1026646559.

The spelling of 28681465 in words is "twenty-eight million, six hundred eighty-one thousand, four hundred sixty-five".