28238997 has 8 divisors (see below), whose sum is σ = 39633760. Its totient is φ = 17835120.

The previous prime is 28238971. The next prime is 28238999. The reversal of 28238997 is 79983282.

It is a happy number.

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

It is not a de Polignac number, because 28238997 - 2⁶ = 28238933 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 (28238999) 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, 247654 + ... + 247767.

It is an arithmetic number, because the mean of its divisors is an integer number (4954220).

Almost surely, 2^28238997 is an apocalyptic number.

It is an amenable number.

28238997 is a deficient number, since it is larger than the sum of its proper divisors (11394763).

28238997 is a wasteful number, since it uses less digits than its factorization.

28238997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495443.

The product of its digits is 435456, while the sum is 48.

The square root of 28238997 is about 5314.0377303892. The cubic root of 28238997 is about 304.5204216232.

The spelling of 28238997 in words is "twenty-eight million, two hundred thirty-eight thousand, nine hundred ninety-seven".