28171488 has 24 divisors (see below), whose sum is σ = 73950408. Its totient is φ = 9390464.

The previous prime is 28171483. The next prime is 28171501. The reversal of 28171488 is 88417182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×28171488² = 1587265472268288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146631 + ... + 146822.

It is an arithmetic number, because the mean of its divisors is an integer number (3081267).

Almost surely, 2^28171488 is an apocalyptic number.

It is an amenable number.

28171488 is an abundant number, since it is smaller than the sum of its proper divisors (45778920).

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

28171488 is a wasteful number, since it uses less digits than its factorization.

28171488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293466 (or 293458 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The square root of 28171488 is about 5307.6819799231. The cubic root of 28171488 is about 304.2775627494.

The spelling of 28171488 in words is "twenty-eight million, one hundred seventy-one thousand, four hundred eighty-eight".