28242137 has 32 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 20433600.

The previous prime is 28242119. The next prime is 28242199. The reversal of 28242137 is 73124282.

It is not a de Polignac number, because 28242137 - 2⁶ = 28242073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28242107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65312 + ... + 65742.

It is an arithmetic number, because the mean of its divisors is an integer number (1181952).

Almost surely, 2^28242137 is an apocalyptic number.

It is an amenable number.

28242137 is a deficient number, since it is larger than the sum of its proper divisors (9580327).

28242137 is a wasteful number, since it uses less digits than its factorization.

28242137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509.

The product of its digits is 5376, while the sum is 29.

The square root of 28242137 is about 5314.3331660708. Note that the first 3 decimals coincide. The cubic root of 28242137 is about 304.5317081275.

The spelling of 28242137 in words is "twenty-eight million, two hundred forty-two thousand, one hundred thirty-seven".