28237040 has 80 divisors (see below), whose sum is σ = 74474400. Its totient is φ = 9870336.

The previous prime is 28237009. The next prime is 28237043. The reversal of 28237040 is 4073282.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28237043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19046 + ... + 20474.

It is an arithmetic number, because the mean of its divisors is an integer number (930930).

Almost surely, 2^28237040 is an apocalyptic number.

28237040 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 28237040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37237200).

28237040 is an abundant number, since it is smaller than the sum of its proper divisors (46237360).

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

28237040 is a wasteful number, since it uses less digits than its factorization.

28237040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1468 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28237040 is about 5313.8535922624. The cubic root of 28237040 is about 304.5133869041.

The spelling of 28237040 in words is "twenty-eight million, two hundred thirty-seven thousand, forty".