28881651 has 8 divisors (see below), whose sum is σ = 39836880. Its totient is φ = 18590432.

The previous prime is 28881649. The next prime is 28881659. The reversal of 28881651 is 15618882.

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 28881651 - 2¹ = 28881649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28881659) 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, 165900 + ... + 166073.

It is an arithmetic number, because the mean of its divisors is an integer number (4979610).

Almost surely, 2^28881651 is an apocalyptic number.

28881651 is a deficient number, since it is larger than the sum of its proper divisors (10955229).

28881651 is a wasteful number, since it uses less digits than its factorization.

28881651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332005.

The product of its digits is 30720, while the sum is 39.

The square root of 28881651 is about 5374.1651444666. The cubic root of 28881651 is about 306.8131752429.

The spelling of 28881651 in words is "twenty-eight million, eight hundred eighty-one thousand, six hundred fifty-one".