28171550 has 96 divisors (see below), whose sum is σ = 63638784. Its totient is φ = 9152000.

The previous prime is 28171543. The next prime is 28171553. The reversal of 28171550 is 5517182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214985 + ... + 215115.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^28171550 is an apocalyptic number.

28171550 is an abundant number, since it is smaller than the sum of its proper divisors (35467234).

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

28171550 is a wasteful number, since it uses less digits than its factorization.

28171550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 28171550 is about 5307.6878205109. The cubic root of 28171550 is about 304.2777859680.

The spelling of 28171550 in words is "twenty-eight million, one hundred seventy-one thousand, five hundred fifty".