28916551 has 8 divisors (see below), whose sum is σ = 29232000. Its totient is φ = 28603128.

The previous prime is 28916539. The next prime is 28916557. The reversal of 28916551 is 15561982.

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 28916551 - 2⁵ = 28916519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28916551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28916557) 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, 57700 + ... + 58198.

It is an arithmetic number, because the mean of its divisors is an integer number (3654000).

Almost surely, 2^28916551 is an apocalyptic number.

28916551 is a deficient number, since it is larger than the sum of its proper divisors (315449).

28916551 is a wasteful number, since it uses less digits than its factorization.

28916551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013.

The product of its digits is 21600, while the sum is 37.

The square root of 28916551 is about 5377.4111801126. The cubic root of 28916551 is about 306.9367077664.

The spelling of 28916551 in words is "twenty-eight million, nine hundred sixteen thousand, five hundred fifty-one".