28244497 has 4 divisors (see below), whose sum is σ = 29905956. Its totient is φ = 26583040.

The previous prime is 28244479. The next prime is 28244501. The reversal of 28244497 is 79444282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24561936 + 3682561 = 4956^2 + 1919^2 .

It is a cyclic number.

It is not a de Polignac number, because 28244497 - 2⁷ = 28244369 is a prime.

It is a super-2 number, since 2×28244497² = 1595503221566018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28244467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830704 + ... + 830737.

It is an arithmetic number, because the mean of its divisors is an integer number (7476489).

Almost surely, 2^28244497 is an apocalyptic number.

It is an amenable number.

28244497 is a deficient number, since it is larger than the sum of its proper divisors (1661459).

28244497 is a wasteful number, since it uses less digits than its factorization.

28244497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661458.

The product of its digits is 129024, while the sum is 40.

The square root of 28244497 is about 5314.5552024605. Note that the first 3 decimals coincide. The cubic root of 28244497 is about 304.5401904272.

The spelling of 28244497 in words is "twenty-eight million, two hundred forty-four thousand, four hundred ninety-seven".