28919551 has 8 divisors (see below), whose sum is σ = 29633024. Its totient is φ = 28213920.

The previous prime is 28919549. The next prime is 28919563. The reversal of 28919551 is 15591982.

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 28919551 - 2¹ = 28919549 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 (28919531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5881 + ... + 9613.

It is an arithmetic number, because the mean of its divisors is an integer number (3704128).

Almost surely, 2^28919551 is an apocalyptic number.

28919551 is a deficient number, since it is larger than the sum of its proper divisors (713473).

28919551 is a wasteful number, since it uses less digits than its factorization.

28919551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921.

The product of its digits is 32400, while the sum is 40.

The square root of 28919551 is about 5377.6901175133. The cubic root of 28919551 is about 306.9473219677.

The spelling of 28919551 in words is "twenty-eight million, nine hundred nineteen thousand, five hundred fifty-one".