28653937 has 4 divisors (see below), whose sum is σ = 30858100. Its totient is φ = 26449776.

The previous prime is 28653931. The next prime is 28653991. The reversal of 28653937 is 73935682.

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 4800481 + 23853456 = 2191^2 + 4884^2 .

It is a cyclic number.

It is not a de Polignac number, because 28653937 - 2⁷ = 28653809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28653893 and 28653902.

It is not an unprimeable number, because it can be changed into a prime (28653931) 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, 1102062 + ... + 1102087.

It is an arithmetic number, because the mean of its divisors is an integer number (7714525).

Almost surely, 2^28653937 is an apocalyptic number.

It is an amenable number.

28653937 is a deficient number, since it is larger than the sum of its proper divisors (2204163).

28653937 is a wasteful number, since it uses less digits than its factorization.

28653937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204162.

The product of its digits is 272160, while the sum is 43.

The square root of 28653937 is about 5352.9372310910. The cubic root of 28653937 is about 306.0047025350.

The spelling of 28653937 in words is "twenty-eight million, six hundred fifty-three thousand, nine hundred thirty-seven".