28178612 has 48 divisors (see below), whose sum is σ = 61931520. Its totient is φ = 10898400.

The previous prime is 28178561. The next prime is 28178629. The reversal of 28178612 is 21687182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58589 + ... + 59067.

It is an arithmetic number, because the mean of its divisors is an integer number (1290240).

Almost surely, 2^28178612 is an apocalyptic number.

28178612 is a gapful number since it is divisible by the number (22) 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 28178612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30965760).

28178612 is an abundant number, since it is smaller than the sum of its proper divisors (33752908).

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

28178612 is a wasteful number, since it uses less digits than its factorization.

28178612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 690 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 28178612 is about 5308.3530402565. The cubic root of 28178612 is about 304.3032091366.

The spelling of 28178612 in words is "twenty-eight million, one hundred seventy-eight thousand, six hundred twelve".