28240437 has 8 divisors (see below), whose sum is σ = 38019904. Its totient is φ = 18643968.

The previous prime is 28240423. The next prime is 28240447. The reversal of 28240437 is 73404282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28240437 - 2⁷ = 28240309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45388 + ... + 46005.

It is an arithmetic number, because the mean of its divisors is an integer number (4752488).

Almost surely, 2^28240437 is an apocalyptic number.

It is an amenable number.

28240437 is a deficient number, since it is larger than the sum of its proper divisors (9779467).

28240437 is a wasteful number, since it uses less digits than its factorization.

28240437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91499.

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 28240437 is about 5314.1732188554. The cubic root of 28240437 is about 304.5255977036.

The spelling of 28240437 in words is "twenty-eight million, two hundred forty thousand, four hundred thirty-seven".