28541640 has 96 divisors (see below), whose sum is σ = 91068480. Its totient is φ = 7154688.

The previous prime is 28541627. The next prime is 28541647. The reversal of 28541640 is 4614582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28541598 and 28541607.

It is not an unprimeable number, because it can be changed into a prime (28541647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34269 + ... + 35091.

It is an arithmetic number, because the mean of its divisors is an integer number (948630).

Almost surely, 2^28541640 is an apocalyptic number.

28541640 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 28541640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45534240).

28541640 is an abundant number, since it is smaller than the sum of its proper divisors (62526840).

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

28541640 is a wasteful number, since it uses less digits than its factorization.

28541640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28541640 is about 5342.4376458692. The cubic root of 28541640 is about 305.6044271263.

The spelling of 28541640 in words is "twenty-eight million, five hundred forty-one thousand, six hundred forty".