28321671 has 32 divisors (see below), whose sum is σ = 45416448. Its totient is φ = 15348960.

The previous prime is 28321651. The next prime is 28321679. The reversal of 28321671 is 17612382.

It is not a de Polignac number, because 28321671 - 2⁵ = 28321639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321679) 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, 92100 + ... + 92406.

It is an arithmetic number, because the mean of its divisors is an integer number (1419264).

Almost surely, 2^28321671 is an apocalyptic number.

28321671 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28321671 is a deficient number, since it is larger than the sum of its proper divisors (17094777).

28321671 is a wasteful number, since it uses less digits than its factorization.

28321671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its digits is 4032, while the sum is 30.

The square root of 28321671 is about 5321.8108760083. The cubic root of 28321671 is about 304.8173088489.

The spelling of 28321671 in words is "twenty-eight million, three hundred twenty-one thousand, six hundred seventy-one".