28921671 has 32 divisors (see below), whose sum is σ = 45408000. Its totient is φ = 18162144.

The previous prime is 28921661. The next prime is 28921681. The reversal of 28921671 is 17612982.

It is an interprime number because it is at equal distance from previous prime (28921661) and next prime (28921681).

It is not a de Polignac number, because 28921671 - 2⁵ = 28921639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28921601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33240 + ... + 34098.

It is an arithmetic number, because the mean of its divisors is an integer number (1419000).

Almost surely, 2^28921671 is an apocalyptic number.

28921671 is a deficient number, since it is larger than the sum of its proper divisors (16486329).

28921671 is a wasteful number, since it uses less digits than its factorization.

28921671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940 (or 934 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28921671 is about 5377.8872245520. The cubic root of 28921671 is about 306.9548222273.

It can be divided in two parts, 28921 and 671, that added together give a palindrome (29592).

The spelling of 28921671 in words is "twenty-eight million, nine hundred twenty-one thousand, six hundred seventy-one".