28471860 has 72 divisors (see below), whose sum is σ = 86800896. Its totient is φ = 7554240.

The previous prime is 28471847. The next prime is 28471867. The reversal of 28471860 is 6817482.

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 (28471867) 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, 65845 + ... + 66275.

It is an arithmetic number, because the mean of its divisors is an integer number (1205568).

Almost surely, 2^28471860 is an apocalyptic number.

28471860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28471860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43400448).

28471860 is an abundant number, since it is smaller than the sum of its proper divisors (58329036).

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

28471860 is a wasteful number, since it uses less digits than its factorization.

28471860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28471860 is about 5335.9029226552. The cubic root of 28471860 is about 305.3551716591.

The spelling of 28471860 in words is "twenty-eight million, four hundred seventy-one thousand, eight hundred sixty".