28971629 has 8 divisors (see below), whose sum is σ = 29823768. Its totient is φ = 28123200.

The previous prime is 28971623. The next prime is 28971643. The reversal of 28971629 is 92617982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7562500 + 21409129 = 2750^2 + 4627^2 .

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 28971629 - 2¹⁶ = 28906093 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 28971629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25379 + ... + 26495.

It is an arithmetic number, because the mean of its divisors is an integer number (3727971).

Almost surely, 2^28971629 is an apocalyptic number.

It is an amenable number.

28971629 is a deficient number, since it is larger than the sum of its proper divisors (852139).

28971629 is a wasteful number, since it uses less digits than its factorization.

28971629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855.

The product of its digits is 108864, while the sum is 44.

The square root of 28971629 is about 5382.5299813378. The cubic root of 28971629 is about 307.1314605676.

The spelling of 28971629 in words is "twenty-eight million, nine hundred seventy-one thousand, six hundred twenty-nine".