28666937 has 4 divisors (see below), whose sum is σ = 30872100. Its totient is φ = 26461776.

The previous prime is 28666927. The next prime is 28666949. The reversal of 28666937 is 73966682.

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 12538681 + 16128256 = 3541^2 + 4016^2 .

It is a cyclic number.

It is not a de Polignac number, because 28666937 - 2⁴ = 28666921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28666891 and 28666900.

It is not an unprimeable number, because it can be changed into a prime (28666927) 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, 1102562 + ... + 1102587.

It is an arithmetic number, because the mean of its divisors is an integer number (7718025).

Almost surely, 2^28666937 is an apocalyptic number.

It is an amenable number.

28666937 is a deficient number, since it is larger than the sum of its proper divisors (2205163).

28666937 is a wasteful number, since it uses less digits than its factorization.

28666937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205162.

The product of its digits is 653184, while the sum is 47.

The square root of 28666937 is about 5354.1513800041. The cubic root of 28666937 is about 306.0509726128.

The spelling of 28666937 in words is "twenty-eight million, six hundred sixty-six thousand, nine hundred thirty-seven".