28471248 has 120 divisors (see below), whose sum is σ = 87473568. Its totient is φ = 8591616.

The previous prime is 28471211. The next prime is 28471249. The reversal of 28471248 is 84217482.

It is a super-2 number, since 2×28471248² = 1621223925355008, 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 (28471249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125311 + ... + 125537.

Almost surely, 2^28471248 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 28471248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43736784).

28471248 is an abundant number, since it is smaller than the sum of its proper divisors (59002320).

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

28471248 is a wasteful number, since it uses less digits than its factorization.

28471248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 312 counting only the distinct ones).

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

The square root of 28471248 is about 5335.8455749768. The cubic root of 28471248 is about 305.3529837831.

It can be divided in two parts, 2847 and 1248, that added together give a triangular number (4095 = T₉₀).

The spelling of 28471248 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred forty-eight".