28471284 has 96 divisors (see below), whose sum is σ = 77414400. Its totient is φ = 9041760.

The previous prime is 28471283. The next prime is 28471307. The reversal of 28471284 is 48217482.

It is a super-2 number, since 2×28471284² = 1621228025217312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28471283) 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, 360357 + ... + 360435.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^28471284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28471284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38707200).

28471284 is an abundant number, since it is smaller than the sum of its proper divisors (48943116).

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

28471284 is a wasteful number, since it uses less digits than its factorization.

28471284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 202 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28471284 is about 5335.8489483868. The cubic root of 28471284 is about 305.3531124825.

The spelling of 28471284 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred eighty-four".