28171932 has 24 divisors (see below), whose sum is σ = 67855872. Its totient is φ = 9087600.

The previous prime is 28171921. The next prime is 28171939. The reversal of 28171932 is 23917182.

It is a super-2 number, since 2×28171932² = 1587315505225248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28171893 and 28171902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171939) 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, 37494 + ... + 38237.

It is an arithmetic number, because the mean of its divisors is an integer number (2827328).

Almost surely, 2^28171932 is an apocalyptic number.

It is an amenable number.

28171932 is an abundant number, since it is smaller than the sum of its proper divisors (39683940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28171932 is a wasteful number, since it uses less digits than its factorization.

28171932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75769 (or 75767 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 28171932 is about 5307.7238059266. The cubic root of 28171932 is about 304.2791612749.

The spelling of 28171932 in words is "twenty-eight million, one hundred seventy-one thousand, nine hundred thirty-two".