28400841 has 24 divisors (see below), whose sum is σ = 48947040. Its totient is φ = 16228296.

The previous prime is 28400819. The next prime is 28400843. The reversal of 28400841 is 14800482.

It is not a de Polignac number, because 28400841 - 2⁶ = 28400777 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28400843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9411 + ... + 12056.

It is an arithmetic number, because the mean of its divisors is an integer number (2039460).

Almost surely, 2^28400841 is an apocalyptic number.

28400841 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28400841 is a deficient number, since it is larger than the sum of its proper divisors (20546199).

28400841 is a wasteful number, since it uses less digits than its factorization.

28400841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21490 (or 21477 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28400841 is about 5329.2439426245. The cubic root of 28400841 is about 305.1010719403.

It can be divided in two parts, 28400 and 841, that added together give a square (29241 = 171²).

The spelling of 28400841 in words is "twenty-eight million, four hundred thousand, eight hundred forty-one".